[drcy]

A key is to try and photomatch your game used whatever with photos from the game. That's what experienced game used collectors do. Look for matching wear, details, patch placement, etc.

If you ever visit the game used forum at gameuseduniverse.com, they are often analyzing photos and talking about photo matches. If you haven't visited, it's a good site with many experienced collectors, dealers and authenticators and much discussion.