I'm doing volunteer work for my school at an op shop tomorrow and its really boring. I was thinking of leaving early and going to gamestop to trade in some games and get dead space. I haven't really traded in games before so I'm not sure. I'm 16 and I live in Australia. Will I be able to trade in my games without a "guardian", or will I have to just buy the game? Also, would I need my I.D or something? I can't really have a parent with me because I'm supposed to be sticking around the op shop all day xD