>At the moment, civilians can sell to eachother without any paperwork, but, that will again lead to problems when you cant even remember basic details about the person, such as their name or how you contacted.
At the moment the only solution I can think of is: "sell" them to a grandma or an old lady you can trust. And by old I mean real old. Senile old, and tell them about your plan.
>feds knock on her door
>where are the guns? Wat did you do with them
<[typical old lady voice] what guns? I don't remember any guns. are you mildred's kids?
>no ma'am, we're federal agents. we're here about the guns a mr. strelok sold you
<who's that? strelok died in korea years ago… why i remember when-
>your grandson, mr. strelok. According to our list, he sold you *goes through a list of your guns
<i don't know what did i do with them
etc. You get the idea.