You MUST NOT own the game in your library
Your account must be able to trade opened games.
Follow these steps Go to the steam store mainpage. Add any game into your cart Select Purchase as a gift
You cant trade = http://i.imgur.com/nXTCSbt.jpg
Good to go = http://i.imgur.com/odUbPpE.jpg
Collateral = 6 tf2 keys, one which will be your price to open the 4 pack.
High rep = no collateral
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You MUST NOT own the game in your library
Your account must be able to trade opened games.
Follow these steps Go to the steam store mainpage. Add any game into your cart Select Purchase as a gift
You cant trade = http://i.imgur.com/nXTCSbt.jpg
Good to go = http://i.imgur.com/odUbPpE.jpg
Collateral = 6 tf2 keys, one which will be your price to open the 4 pack.
High rep = no collateral