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I think you're trying to trade items from your steam library, you can't do that.
You can't trade them once in your library, should close the thead unless you have games you can trade
We purchase them and don't activate them in our steam libraries. There are a bazillion of sites. Check the sales section of the site for some examples.
You can also trade steam gifts (Select "purchase as gift" while buying)
aerofly FS
Assassin's Creed IV Black Flag
Call of Duty: Black Ops II
Call of Duty: Modern Warfare II
Car Mechanic Simulator 2014
Euro Truck Simulator 2
Garry's Mod
Grand Theft Auto IV
Rust
Silent Hunter 5: Battle of the Atlantic
Surgeon Simulator
Tony Hawk's Pro Skater HD
CSGO Keys
CSGO Skins
CSGO Boxes
H1Z1
Dayz Standalone
Arma III
Kerbal Space Program