Mascara- fake or not?

Hi, this is my first actual post. I bought some MAC mascaras from a US seller, volume waterproof long curling Mascara (it says on the box) . The boxes look really different to other MAC boxes i've seen, but having read some other threads they could just be old. The mascara comes in a sort of squeezy tube with a silver lid. My camera is playing up at the moment otherwise I would post a picture. Just wondered if this is likely to be fake or not? Thanks.
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