Actually guys, there is one aspect of this that I don't think that you have thought out. If this guy were to get gear intercepted on the way to the PO box, and a sting was put in place, then guess what, you were caught with gear on FEDERAL PROPERTY. That means no local prosecution, but federal prosecution that could result in a lot more trouble than it is worth.
Perhaps I'm being a bit paranoid here, but I would stay away from having gear on Federal Property at all costs. Just my $0.02.