How can I tell if a Windows Key is legit?

Solution
If it's on eBay for $30 it's not legit. End of story.

It cost $80-$100 minimum. Buy it from an actual retailer like Amazon or newegg or you will get a fake.

exHorizon

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Nov 25, 2015
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A what? And how do I check if it comes with a "CoA"?