If you have documentation that the Attorney is acting as a representative of the executor then yes, it is acceptable.
From the PA Dept. of Revenue Website:
No one is allowed to enter a safe deposit box, not even a joint owner, except to remove a will and/or burial instructions, which must be removed in the presence of a bank employee. The bank employee must complete PA Form REV-487 (Entry Into A Safe
Deposit Box To Remove A Will Or Cemetery Deed) to record the entry and mail it to the PA Department of Revenue. The contents of safe deposit boxes must be inventoried before they can be removed.
A representative of the estate must be present at the inventory. If the decedent and a surviving joint owner owned the box, the surviving owner should be present. Additionally, an attorney representing the estate may be present.
An estate representative must provide written notice to the department at least seven days in advance of a safe deposit box inventory. The notice must include the name of the estate and the person entering the box; the name and address of the financial institution where the box is located; and the date and time of entry. The notice must be delivered to the department at the address below by the U.S. Postal Service with return receipt service, and a copy of the notice should be provided to the financial institution where the box is located.
PA Dept. of Revenue
Safe Deposit Box Unit
PO Box 280601
Harrisburg, PA 17128-0601
At the time of entry, the estate representative must provide a statement to the financial institution verifying notice was provided to the department. Within 20 days of entry, the estate representative must return a completed Safe Deposit Box Inventory form, REV-485, to the department’s Safe Deposit Box Unit.
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