I won this and when I went to redeem I got this:

"The product code you've entered has already been activated by a different Steam account. This code cannot be used again. Please contact the retailer or online seller where the code was purchased for assistance."

my steam say :
The price difference between regions, the present is trying not to be delivered in the recipient's region. so I can not send the game to you I'm sorry for the inconvenience and mark it as not received