I got a new xbox 360 and for some reason when I am not connected to xbox live the map packs and stuff that came with the legendary edition are all gone and I tried downloading them again from download history but they only show up in the game if I am connected to xbox live
I think you need to transfer the DRM.
http://support.xbox.com/en-US/xbox-live/marketplace-and-purchasing/download-content
Hope that helps.