It's already been said, but fake fakity fake. Feedback means nothing for cosmetic sellers on eBay - most people who buy do not realize they're getting fakes. There are tons of sellers with tons of listings for obviously fake MAC, and most of them have perfect or near-perfect feedback.
Contact your seller and tell them they gave you a fake and you want a full refund. They refuse, file a PayPal SNAD (significantly not as described) or do a chargeback.