Appellant George Serafino challenges the judgments of conviction and sentence entered following his jury trial, in the United States District Court for the District of Massachusetts, for mail fraud, money laundering, and conspiracy. See 18 U.S.C. §§ 1341, 1346, 1956, 371. We affirm the district court judgments in all respects.

While employed by Milton Bradley Company ("MBC"), Serafino and codefendant Arthur Peckham participated in a kickback scheme whereby Peckham, MBC's vice president, instructed MBC's vendors, Frank Gentile, Inc. ("Gentile") and Edaron, Inc. ("Edaron"), to inflate various charges on their invoices to and lease agreement with MBC, and to divert the surplus funds — totaling more than $840,000 — either directly to these defendants or indirectly to two companies owned by Serafino. Neither defendant disclosed the kickbacks to MBC.1

Serafino first contends that the district court abused its discretion in denying his motion to sever his trial from Peckham's. See Fed.R.Crim.P. 14. This contention is predicated on (i) a statement by Peckham's counsel during opening argument that Peckham was not directing Serafino in the alleged money-making enterprise, and (ii) an admission by Peckham that the monies Gentile ultimately disbursed to Peckham and Serafino were equal in amount. Serafino insists that these statements were fatally antagonistic to his anticipated defense: viz., that he was an unwitting dupe who blindly carried out orders in the fraudulent scheme devised by Peckham.

We discern no plain abuse of discretion. See United States v. Sotomayor-Vazquez, 249 F.3d 1, 16-17 (1st Cir.2001) (prescribing "plain abuse of discretion" standard of review and noting "strong preference in the federal system for jointly trying defendants involved in related crimes, ... unless `there is a serious risk that a joint trial would compromise a specific trial right of one of the defendants or prevent the jury from making a reliable judgment about guilt or innocence'") (citation omitted). Even assuming, arguendo, that Serafino and Peckham presented somewhat antagonistic defenses, Serafino would have had to demonstrate that the "defenses [were] so irreconcilable as to involve fundamental disagreement over core and basic facts," United States v. Peña-Lora, 225 F.3d 17, 34 (1st Cir.2000) (citation omitted; emphasis added), cert. denied, 531 U.S. 1114, 121 S. Ct. 860, 148 L. Ed. 2d 774 (2001), such that "the jury unjustifiably [would] infer that this conflict alone demonstrate[d] that both [defendants] [were] guilty," United States v. Talavera, 668 F.2d 625, 630 (1st Cir.1982) (emphasis added).

A thorough record review has disclosed no such irreconcilability. Serafino never disputed that the MBC vendors funneled payments through his companies' accounts, and Peckham's contention that he was neither the mastermind nor the driving force behind the scheme did not necessarily require that the jury either accept or reject the defense that Serafino was an unwitting participant.

Next, Serafino insists that the district court abused its discretion by admitting in evidence the trial testimony offered by IRS Agent Harry Kavrakis. Serafino asserts that the government failed to provide adequate advance notice of the nature of the Kavrakis testimony, which focused on the financial benefits Serafino realized from the kickback scheme and constituted an improper attempt to establish tax evasion even though the indictment included no such charge.

Although a tax evasion charge likewise may have turned upon whether Serafino received unreported income, the government's proffer relating to Serafino's receipt of these kickbacks constituted crucial evidence, inter alia, that he knowingly participated in the mail fraud conspiracy. Thus, unquestionably the Kavrakis testimony — that Serafino realized financial benefits from the scheme — was independently relevant to the mail fraud, money laundering, and conspiracy counts as well. See, e.g., United States v. Isabel, 945 F.2d 1193, 1203 (1st Cir.1991) (noting that evidence of receipt of financial benefits may be probative of defendant's intent to facilitate conspiracy). Finally, the trial record plainly belies any contention that Serafino did not know the nature of the Kavrakis testimony sufficiently in advance of trial.2

Serafino next contends that it was reversible error to instruct the jury, sua sponte, that Kavrakis was testifying as an expert witness for the government. Since no objection was asserted, either during or following the jury charge, we review only for plain error. See United States v. Lemmerer, 277 F.3d 579, 591 (1st Cir.2002) (no "plain error" unless ruling was clearly or obviously erroneous, affected defendant's substantial rights and impaired the right to fair trial). We discern no plain error.

First, even though it was not requested by the government, the expert witness instruction was arguably correct. That is, presumably Kavrakis was qualified to testify as an "expert" regarding the amount of Peckham's outstanding tax liability on the tax evasion count. Indeed, during the trial there were open references to Kavrakis as an "expert," both by the government ("our expert witness") and by the district court ("The testimony of the Government's expert was that Mr. Peckham had a good deal more income than he reported."). Yet the defense asserted no objection. Although it may well have been more prudent to instruct the jury, in specific terms, that Kavrakis was to be considered an expert witness in regard to the tax evasion issue only, viewed in context the sua sponte charge certainly did not "blindside" the defense, nor was it obviously erroneous.

Furthermore, the district court's passing reference to Kavrakis as an "expert" did not, in all probability, substantially impair Serafino's right to a fair trial, given that (i) by its express terms the jury charge applied exclusively to Kavrakis' "opinions," and the jury common-sensically would not have regarded the Kavrakis testimony — "number-crunching" the figures summarized in Exhibit 675 — as an expert "opinion," but rather as an objective rendition of the historical data demonstrating that Serafino had received proceeds from the fraudulent scheme,3 and (ii) the district court immediately mitigated whatever special aura the jury might otherwise have attached to the term "expert," by emphasizing that "[e]xpert testimony should be considered just like other testimony." (Emphasis added.)

Serafino next contends that the district court abused its discretion in rejecting his request for an evidentiary hearing regarding whether he had been prosecuted vindictively by the government based on his involvement in the kickback scheme, even though various other participants were never prosecuted. See United States v. Graham, 146 F.3d 6, 9 (1st Cir.1998). Since the government is presumed to have exercised its prosecutorial responsibilities in good faith, however, defendants are not entitled to evidentiary hearings on their selective or vindictive prosecution claims unless they first identify facts tending to demonstrate (i) that the government refrained from prosecuting others who were "similarly situated," and (ii) that the reasons for any such discrimination were illegitimate. See id. Serafino managed neither showing.

First, unlike Serafino, who received several thousands of dollars in kickbacks, the MBC vendors who disbursed the kickbacks received no proceeds for their personal benefit; second, the MBC vendors provided their full cooperation to the prosecution. See, e.g., Bordenkircher v. Hayes, 434 U.S. 357, 361-62, 98 S. Ct. 663, 54 L. Ed. 2d 604 (1978) (noting that, without more, the government's decision to indict a defendant who rejects a plea agreement normally is not deemed vindictive for purposes of a selective prosecution claim). Moreover, other MBC officials, such as its former president, George Ditomassi, were implicated only by Serafino's uncorroborated allegations of their complicity in the scheme, including his bald accusation that he placed some kickback proceeds, in cash, in the trunk of Ditomassi's automobile, an allegation which the government — quite understandably — was not able to verify. See, e.g., United States v. Peterson, 233 F.3d 101, 105 (1st Cir.2000) (noting propriety of government's consideration of an important discrepancy in the respective levels of participation by two individuals in narcotics distribution scheme for purposes of assessing whether the two were "similarly situated" for purposes of determining whether to prosecute). Since Serafino's "selective prosecution" allegations were not colorable, the district court correctly declined to conduct an evidentiary hearing.

E. Sufficiency of Evidence: Deprivation of Property or Honest Services

Serafino further contends that the government adduced insufficient evidence on the mail fraud charge, in that it failed to establish either that MBC sustained a loss of "property or other items of economic value by false pretenses," or that Serafino engaged in "a scheme to defraud MBC of [its employee's] honest services by false pretenses." United States v. Martin, 228 F.3d 1, 15-16 (1st Cir.2000); see 18 U.S.C. § 1346. Serafino argues that (i) he was convicted only on the counts involving kickbacks from Edaron, not on those involving Gentile; (ii) MBC suffered no financial harm due to the Edaron kickbacks, since Peckham had no control over MBC's decision to do business with Edaron, and MBC presumably received full value from Edaron for those contract services because Edaron was the low bidder in an "arms length" transaction; and (iii) the government failed to adduce any evidence that Edaron's lease to MBC was not for fair market value. Finally, Serafino argues that MBC was deprived of neither Peckham's nor Serafino's honest services, since the government failed to prove that any MBC policy prohibited its employees from retaining undisclosed kickbacks from MBC vendors. These contentions are belied by the record as well.4

In the first place, Serafino was not acquitted of all counts relating to the Gentile kickbacks; the conspiracy charged in count 1 explicitly encompassed these kickbacks. Second, Peckham expressly instructed both Gentile and Edaron to inflate their charges to MBC, on both contracts and leases, and to pass the resulting windfall along to him and Serafino. The evidence of the deliberate inflation of these charges, together with the remittance of the resulting surplus to the codefendants, plainly sufficed to establish the requisite cognizable financial harm to MBC under section 1346. Cf. United States v. Jain, 93 F.3d 436, 441-42 (8th Cir.1996) (vacating mail-fraud verdict against psychiatrist who received kickbacks from hospital for patient referrals, since all patients needed hospitalization in any event and apparently received their money's worth in quality medical care). Finally, the government called MBC officials who testified — not surprisingly — that MBC imposed on its employees a duty of loyalty which would have required Peckham and Serafino to inform MBC that they were receiving kickbacks from any MBC vendors. It is undisputed that no such disclosure was ever made by Serafino.5

F. Sufficiency of Evidence; Foreseeability of Use of Mails

Finally, Serafino contends that the government adduced insufficient evidence that he reasonably could have foreseen use of the mails in furtherance of the kickback scheme, see United States v. Royal, 100 F.3d 1019, 1030 (1st Cir.1996) (noting that the defendant need not have used the mails, but must reasonably have foreseen their use by others to facilitate conspiracy), since Gentile and Edaron did not mail the kickback checks to Serafino's two companies. As Serafino failed to preserve this issue in his motions for judgment of acquittal, we may reverse the judgment of conviction only if Serafino demonstrates a "clear and gross injustice." United States v. Van Horn, 277 F.3d 48, 54 (1st Cir.2002). He has not done so.

The government established, beyond a reasonable doubt, that MBC mailed its invoices and lease payments to Gentile and Edaron, and through that eminently foreseeable mechanism delivered the very monies Edaron and Gentile "kicked back" to the codefendants. No more evidence was needed. See United States v. Woodward, 149 F.3d 46, 63 (1st Cir.1998) (noting that use of mails may be either central or merely "incidental" to mail or wire fraud scheme) (emphasis added).6

As the remaining contentions advanced by appellant are utterly lacking in merit, no separate discussion is warranted. Accordingly, the judgments of conviction and sentence are affirmed.

Affirmed.