Team Fortress 2
Counter-Strike: Global Offensive
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"Who said you could leave me out of the fun? :^)"
Sold for 15 Keys
Sold for 16 Keys
Sold for an Australium Grenade Launcher(14 Keys) and ~4 Keys in Sweets(18 Keys total)
Credits to Mindacos for finding the proof. All I did was make the actual suggestion.