How do they prove you didn't sell it? I had to have the conversation with a couple ATF agents once. Conversation went something like...This is my fear about selling to an individual where the gun is registered in my name with ATF. How do you prove you actually sold it.
atf: You were the last known person to own this gun...
me: I sold it.
atf: To who?
me: Don't actually know him. Mike was the name he gave me.
atf: Anything else you can tell us about him?
me: He was driving a silver compact sedan; cant remember the make. He looked like he lifted weights.
atf: Ok, thanks for helping us out.
What's extra funny is I was given a heads up that the ATF was tracing it. It took the ATF agents almost a year before they actually reached out to me.