I am guilty of going to auctions for over 40 years. Used to be able to leave your purchases in a pile and they would be there when you got ready to go. Trust no body now- take your purchase to the truck or it will disappear. Have called the sheriff on a confused person who took my property. In Ohio auctioneer takes your name for guns. The law never sees this. Quite a loophole if you ask me.
Here in Utah the private sale of guns works like this. I can sell you a gun of mine and take as little or as much info from you as I want and am required to show no one.