Is there a FAKE Otterbox Preserver case for iPhone 5s?

I want to buy an Otterbox Preserver case from someone, the case with Touch ID compatibility, and he's selling it at $20 (Around 16USD cheaper)lower than retail price. The thing is, I do not know if he is a trusted seller, although the case looks pretty good to me.

Does anyone know if people have released FAKE versions of this case? If you do, can you tell me how to spot the difference?

The price is too low.

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