Considering the somewhat nomnal cost of inter- island air travel, why not ask him to fly over with a case, verify paperwork, case it up, and let him fly back with it.
The flight cost may well be about the same as a couple of FFL fees, one from each end. I asked a FFL here, and he said his current fee was $75, a lot more than you Oahu guys pay.
No USPS BS, no worries.