Stay away - FAKE - over the years I've collected I've had at least 5-6 pairs of royal blue pass through my hands or on my feet & the first dead giveaway these are fake is the bad colour of the shoe itself
1) The blue is too bright, real Foam Pro Bs are a darker "navy" royal blue with an almost metallic sheen to them. The blue on these "pops" too much.
2) The rear of the sole is another clue; the rear part with that crosshatching effect? On real Foam Pros, NOT there. instead it has a blue inset section.
Hope that helps but just from the wear on these I hope you are getting a deal - these appear really beat & worn but like I said from my experience with Foams I'm going with FAKE
Did a little Googling, check this site for reference to the points I made above:
http://www.kixsquare.com/...oamposite-pro-royal-blue
Good luck.