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What do you mean, 4-Packs? When you buy a 4-Pack one game is activated on your account... So you will only have three to sell from each pack. 4 copies / 4 keys, would that be 1 key per copy?
It's possible to buy 4-packs as a (single) gift (and whoever who activates it will get 3 gift copies in their inventory). And, I guess, it'll be a key per copy.