I don't know about "todays rules" but in the olden days leaving it in a safety deposit box was common. It hasn't left your possession because your the one with the key. Deploy to Iraq, lock it up 'til you get back sort of thing. When MG's got expensive buyers and sellers would open a box together where neither one could get at it til the transfer went thru. That way the seller couldn't disappear with the gun and the money. But times do change !