IME, there is absolutely zero paper record of any person-to-person long gun exchange.....regardless of what planet in the universe they reside on. I don't have, and am not required to have , a single shred of evidence of where, how or from whom I acquired any of my long guns.

Agonizing over selling a shotgun to an individual, unless you're being framed by your federal government as Randy Weaver was, is akin to worrying about the mattress tag you removed.