I did do a FTF sale with someone that had someone else pick it up. Was emailing with someone in the springs, he had a friend in Denver pick it up.
I did insist in that case for full name & address copied from drivers license though (I wrote it down). As far as I'm concerned I sold it to his friend in Denver. Couple years later while sorting though old papers it got thrown away.
i got one similar for a rifle, it seems fishy so i ignored him.
Did he write email like this?
"Yeah, still up for sale....i'm no longer in CO....tho....but i can ship to your FFL....if you pay shipping...."