IMPORTANT UPDATE : After making contact with Otterbox this case has found to be fake! A refund was received from the seller who claims it was a genuine mistake. The original post has been corrected by removing any reference to this case being genuine and any Otterbox related conclusions then, I would like to stress Otterbox were extremely helpful as was the original seller, however at this point I will use this post and associated gallery as an illustration of what you can look for for!
For clarity here is a copy of the confirmation I received from OtterBox informing me the case was fake :
