In order to rent a mailbox, the U.S. Post Office requires that you fill out a 1583 form, which requires one picture ID and a second form of identification. One form of identification must verify your home address. Identification must be presented in person at the store, or notarized.

1583 Form

Instructions for 1583 Form

To clarify the terms and parameters of service we require a mailbox rental agreement to be filled out and kept on file:
Rental Agreement

If you anticipate forwarding your mail, you will need the following form:
Forwarding Activity Ledger