Caps and jerseys are a bit tricky. Cause you can buy the same hat the players wear. You need to be wary, especially when buying a star player. You can check for multiple examples of the said players items, check if the writing is the same, sweat stains etc.

Jerseys are a beast of themselves. Make sure the code on the tags are for gamers and not retail. Once again, do you homework first before buying. Dave Mediema is a great person to ask about jerseys and hats.