I sold 4 guns last year before I moved face to face. Had them come to my house, did it at my desk, printed out the copy, done.
When I ran out of MA transfers I had to dump that stuff at a shop on consignment. Luckily, it all sold very fast and for considerable amounts of money.
Don't be worried at all unless it's a new user, a user with little to no legitimate posts, use with no or weird feedback, etc.
I think mikejr was the last "known" person to completely f*** up a fairly large group buy here. I knew him growing up. He's extremely eccentric, and generally was a good dude but he really f***ed that group buy up and I had enough of him. It was so inconsiderate of him to do that. Classic NES, very few people in that buy even left him feedback to let others know to stay away. The system isnt working if you do that, people.
In his case though after that incident, it didn't matter because he was gone in a puff of smoke after that. That was probably top 5 most famous GBs gone bad, ever.