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http://www.steamtrades.com/trade/VxO1y/h-xcom-enemy-unknown-steam-key-origin-account-with-12-games-proof-w-arma-iii-offers Everything there + All my CS:GO guns and cases in my INV for arma 3?
A little advice: don't try to trade games like XCOM (and half of your Origin games) that have been given out for free.
The prices below are in pure keys.
On sale:
Also available: