I just bought a 4 pack and only had 2 friends who might play with me, so I have this extra copy. It's currently sitting as a gift in my inventory, so I guess you'll have to add me temporarily or send me your steam email address to get it. To be honest I'm not so sure how this works when dealing with gifts rather than keys. Even though it's not much, it feels good to be able to give something away for once. Good luck, everyone!