Are you really sure that they will be destroyed? The cops here (not sure if it's the PD or the Sheriff) have auctions now and then, where they sell the guns. The fully automatic ones would be iffy, but I can't see why you can't sell a semi or a revolver if they can't prove the ownership and are going to destroy them anyway. You could ask your son to call the Police Dept. or the Sheriff here and ask how they do it, I can provide the contact info if you send me a PM.
BTW: I read the list for the previous auction, but it was mostly Saturday Night Specials and cheap shotguns. Not even worth going, but I would go to your home town if they decide to auction them off.
