The other thing to worry about is fake CAC stickers. I've seen them so I know they're out there. Sometimes on real slabs and sometimes on counterfeit slabs. You need to remember a sticker is only a sticker and a sticker is very easy to copy and make. Even if the sticker isn't quite right most people only see the green or gold color and not really take the time to look very close at the sticker. This is another reason not to pay more because of a sticker. It always seems to go back to the main concept in buying coins. Buy the coin and not the plastic and now not the sticker.