Football Shirt Culture.com

I am manly into autographs and have this auction house in America that I buy from. This weekend they had this shirt I bought.

It was described as David Beckham's game authentic Jersey (not worn but it was issued to him) signed on the front in felt tip ink by Beckham.

Since this is a remarkable game to get any shirt from I was wondering on what I should look at when I get it to make it sure it is what it states?