I feel sure that AZ Jane is right on about the receipts, and that the clerk used the wrong terminology. Our PO is closed on Saturdays which is inconvenient. If I place mail in my mailbox, it does not go out until the next day generally because the carrier does not get back to the PO in time for it to go out that day. If I get a package that's too large for my mailbox, I have to pick it up at the PO because I live .06 of a mile from the mailbox so they won't deliver to my house.