How to tell the difference between a real and fake life proof case?

Today i went to platos closet and they had a life proof iPhone 4 or 4s case for sale. I bought it and i was wondering how to tell if its real or fake? It has codes on the front piece and the back piece but it says patent pending on the back. My friend has an iPhone 5 life proof case and it looks very similar to it but i didn't know if there were any special ways to tell between real or fake. Also how can I know how to tell the i all of my seals are correctly shut so i can take it under water. Thanks so much any additional info would be great too!

If you TEST it, using the instructions WITHOUT the iPhone in it I would think that would be a good test.

Call Life Proof and ask them. They will probably have a way to tell you. I do not think you can get in trouble for buying it!

What did it cost?

I might want to buy one by golly!