A heads up: you tried to give away this game, but actually delivered a key for this game. A such, the system will think the winner didn't activate the key for the game he won, and he will get suspended if he gets reported. I already notified the giveaway winner, your best option is talking with him and staff, and asking staff to delete this giveaway if you don't want any problems. GL!
ps I'm not a staff member, just a user who almost committed your same mistake.

i cant mark thiis gift as Not Received due to 1 week caldown. i resently marked it as reseived because miss the point that key was from another game(((