Not interested in the jersey or the price, but am wondering if the seller is just confused or what is going on with this jersey? Why would he post a picture of the retail tag...6200...and try and say this is a game used jersey? Thoughts?

Seller says he is a dealer who specializes in Astros Memorabilia...how can he make this claim and try to sell this retail coded jersey as game used? Or is there a chance this jersey was used in an MLB game? is size 56 correct for Pettitte?