Yeah, we will see what they do. We can get mail at our house, just working during the day and the mailbox at the house is not monitored until after work. The PO is right across the street from my office and since it stays locked I like everything to be sent there. We will see what happens when time comes. I appreciate all the replies and help. If USCIS says anything about using a PO Box, I will be sure to update here. We don't file the I-751 until mid August.