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I'll give you 3 keys for all. Best offer you're gonna get.
I'll rather sell them all in the market for more.
All 234 different Backgrounds / Emoticons from my inventory:
http://steamcommunity.com/id/dragonfruut/inventory/#753_6
( I spent 20€ Steam Wallet and many hours to collect them )
Looking for 12 Keys and i'm only trading them all at once!