ive got the collectors edition of revelations. I went onto the section where you enter your exclusive content code and when i entered the code it said the code had already been used. i havent used the code and no one else knows i've got one. I got the game brand new for christmas still shrink wrapped and everything. im barely on xbox live as i dont have an adapter and use my dads laptop to connect, which isnt often. Is there somthing wrong with the code or has it been stolen somehow?