I don't know if you're going to get much feedback about game-used equipment on an autograph forum, and I doubt anyone is familiar with a seller who has a feedback rating of 13. But here are my two cents - the lack of any documentation is a bit puzzling for game-used gear, and at the vary least raises the question of how he got it. While I wouldn't know how to ID authentic game used items (and I'm not sure if anyone else could without verifying the source). Strange he's selling a Colt's helmet without noting that 87 is Reggie Wayne.
The whole thing is shady at best.