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There's a glitch that allows to multiply coupons every time you restart Steam.
Those duplicated coupons will probably be revoked, so don't trade for any coupons until those issues are officially resolved.
Mods on official forums are closing threads offering some of the coupons
http://forums.steampowered.com/forums/showthread.php?t=2608951
bump
There's still this rollback Steam trade feature.
seems certain coupons only will be available (ubisoft week or something?) its a pitty i have almost everything from ubisoft. if someone finds out more about this glitch or what those coupons are/will be about post here please
Thanks. Added that to the op
There's a glitch that allows to multiply coupons every time you restart Steam.
Those duplicated coupons will probably be revoked, so don't trade for any coupons until those issues are officially resolved.
Mods on official forums are closing threads offering some of the coupons
http://forums.steampowered.com/forums/showthread.php?t=2608951