One thing I have noted recently is people selling Razorock Stealth Slants and misrepresenting which version they are. A lot of people advertise as V1 or V4 as they are the rarest and hardest to get but there are some differences. In the case of the V1 the differences are quite obvious but the V4 is a little harder to tell.
As an example I just saw a V1 that was advertised as a V4 with the guy claiming that he had owned it from new and had not used it. I would think that if you bought it new you would know what version it was.