Fake or not Aspire Nautilus Mini tank

I am wondering if there is anyway to tell a real Aspire Nautilus Mini from a clone? I have seen where some people are buying the ones with the security codes on the back of the box, but it doesn't register(not real) when they put in the code. Are the tanks made in china? Not that it's a bad thing, just wondering if there's a way to tell easier than taking it home or buying it somewhere online and not being able to return it.
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