Well there is nothing you can do since you traded for the game. You should be more careful when you buy steam gifts from bots or other traders.
Your only hope was to talk with the guy who gave you the copy, and kindly ask him (as its not his fault) to take the copy back and give you your items, if he's ignoring you... im sorry but there is nothing you can do to get a refund.
Maybe it would be a good idea to re-sell it, maybe at the same or lower price. In this way you might just get a few items back. I guess its better than being unable to activate that copy right ? I wish you good luck :
)
not true my freind. you need to learn dispenser a lil more. alot of games do not say locked when you search for the game no way to tell till you actually get it in your inventory. there should be a penalty for anyone that puts locked games in thier store, as they do it know they can pass it off on some unsuspectying person. and that is wrong on so many levels