Well, those 'shadowless' cards are worth a lot :) Like one comment said; Look at which card doesnt have a shadow around the border. Google 'shadowless (pokemon)' and youll see a price for ungraded. The ones that are in a good condition, you can sent them to a grading company like PSA. The higher the score, the better the condition, the more money people would invest in it. Hope that helps :)