Hi! I don't know if you're aware, but there are two games with this name on Steam:
One - Two
If the game you're giving was perhaps from a massive giveaway, then the game is actually the first one.

Yep, winner here. This key is for the other game with the same title. I already have that game and have no use for this key.

You might try submitting a support ticket and requesting that the giveaway be deleted. I have no idea if the site admins will grant that request. If not, I'll have to mark the game as not received.

The hell, Angel? 2 days after a dud giveaway and not even an acknowledgement, let alone apologizing for your fuck-up? Well, onto the blacklist with you, then.