I was the moderator of the Buy/Sell forum and the bad trader was the Armor Editor of the site. My knowledge of the matter comes first hand and I tried to act as intermediary to get these resolved. The member/editor left the site and was tracked to a paintball website where he was being accused of similar misdeeds.
He used the "lost in the mail", "bad Canadian postal service", "perhaps it is stuck in customs" excuses for the models. Because he was a staff member, people gave him the benefit of the doubt. It wasn't until I had received a couple of complaints that contained identical situations that I informed the webmaster to look into the problem. After that, all the folks who had bad deals with him came out of the woodwork. So many members chalked it up to an honest mistake until dozens came out with similar stories, all involving the same man. Most were cheated out of a kit or two during a trade. They sent the item, but never received the promised kit.
I looked up his profile on the Armorama website, http://modelgeek.kitmaker.net/user.php?op=userinfo&uname=ex-royal , he used to have a profile picture of him aiming a paintball gun at the camera, but it must have been deleted when he was removed from staff.
One of the more tech savvy members tracked him to the paintball site where members there were complaining about him cheating there. I did visit that site at the time, but don't recall the site off hand (not a paintballer and was amazed at the price the equipment costs).
It's proabably coincidental that modeling and paintballing were his areas of interest. I tried to look for the original thread at Armorama, but it looks like the older sale threads have been deleted.