Put the cards in card savers. They do not like top loaders and make sure the card is centered well. The rest is pretty much a crap shoot unless it is obvious.
Please Note: I do a majority of my transactions through COMC. If you like a card and don't have an account feel free to PM me and we can work something out!
Looking to trade/buy 2011 Topps Marquee Museum Collection Gold Frame Autos /10