is it the sticker on the back of the box that matches the one on the card? itself? (where it has a little window and says to make sure they match before purchasing from the store) it has a bar code on it plus the serial number (both of which are supposed to be sent in) doesn't say upc on it so i want to be sure. i looked all over the box and aside from a "warranty is invalid if removed sticker on the plastic wrap, i see no other signs of UPC code on the box. thank you!