No real way to check yourself, I suppose you can find a trusted mod or someone who owns it to check if it's a valid key.
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Pretty much the only way to be sure it is valid is to find someone who already has it, and get them to attempt to use it.
Course, you'd have to trust them, know them, and actually believe they'll not turn around and give it to someone else before you can trade it.
But seriously, trading keys is dangerous and stupid, very much a bad idea.
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Hey forumites I was wondering I have a Arma 3 key and is there anyway of checking if its legit or not because if so I would rather trade it or something
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