First of all, you posted basketball in the football forum. It's cool...
Panini creates the card with the anticipation that the player will sign (stickers) and return them to them. They can't control the players willingness to oblige. Panini made a decision to send the cards out "as is". If you are unhappy, you can contact customer service and request a replacement, but since your redemption has now been honored, you may be out of luck.
"I see great things in baseball. It's our game--the American game. It will take our people out-of-doors, fill them with oxygen, give them a larger physical stoicism. Tend to relieve us from being a nervous, dyspeptic set. Repair these losses, and be a blessing to us." -Walt Whitman