You do not have legal authority to represent deceased's heirs at law. The heirs under Arizona law should file an affidavit in the probate court to transfer this small estate to the heirs, since we don't know if there is a Will in the box. By following the proper procedure to transfer the small estate, the contents of the box may be sent to the heirs for distribution amongst them. There would be a filing fee with the Court, and you would have an order of distribution which the bank should honor. If they would like an attorney to represent them to accomplish this, I would charge a fee of $1,000.
