I'd say they are fake as well. They look too perfect. Some of colours look a little off as well.
I would check to see if they are made in multiple layers or on one piece of cardboard.
Plus they look like they have never had bubbles glued to them.
I'm not sure if there is a thread about how to spot a fake card back? But if you look at the card back using a magnifying glass, and if it was printed on an inkjet printer, you should be able to see all the little dots.
Here are a couple of quick links.
http://www.imperialgunneryforum.com/t6311-card-back-collectors-thread
http://theswca.com/images-speci/cardbacks/