According to the seller, the shirt is not from 2003, rather, last season.

Dear hblakewolf,

If you do some work, you'll see that Mauer had two rehab starts at Ft. Myers last year (hence the "Best Wishes, Joe Mauer" that he now signs the jersey with. (The Best Wishes) has been tried to be removed by the previous owner.

Howard Wolf
hblakwolf@comcast.net