Well Dudesky and Doughboy have offered to look at it to authenticate it. I did some digging for the past two hours and found numerous complaints from guys on bimmerboard.com, roadfly and bimmerforums.com about this guy. It had to do with him selling body kits for the E38.
If I can get one of these guys to go and check it out, maybe I would offer a deposit and once it is installed, I would pay the rest. I don't think he will buy that, maybe worth a try