I bought the card at WalMart. It was activated at the register when I purchased it. The silver stuff you scratch off the back in order to use it has not been touched. Hope this helps to explain that it is an active card (ready to be used) but has not yet been used. :-)
Oops, ignore that comment. I thought it was my League of Legends card auction you commented on, sorry. I didn't/don't know this game is on Steam. The code was activated when my son played it. Let me look at it and get right back with more info.
Bad news :-( I have screwed up and the auction will have to be deleted. I looked into your question and it led me to find out that the CD key is not transferable. It does link you to Steam when you go to install it and will not accept the CD key because it has been already used. I researched this on Steam and they will not transfer CD keys that have already been used. :-(