i gave everything back including the box, but i'm sure they would exchange it back even if you don't have the box. I don't know about the RE5 edition, they'll just give you an elite.
Today, i went to best buy to exchange my halo xbox for an elite because of the red rings, i forgot to delete everything on the harddrive. So i changed my windows live password and added the xbox live pass code for my account. I left the account on auto-sign in....i hope best buy doesn't resell...