Hey Bungie, I puchased Destiny for the Xbox 360 a couple days ago and was having all those problems like so many others. I kept getting the Nightingale Error Code which meant that I needed to reinstall. I went into my memory and deleted the Destiny Save Files and reinstalled by putting in the disk several times and kept getting the same error code. So I got desperate and deleted all the Destiny files on my 360 which included the Vanguard Armory Weapons I got for preordering and then reinstalled it and the game worked for a few hours then stopped working cause of the Centipede Error that has been plaguing college campuses including mine (Kent State University). Gamestop told me to contact you for a new code if it was possible.
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Go to Xbox.com and go to the download history page (lists all DLC/games you have downloaded or redeemed), then add the vanguard armory to the download Que and it should automatically download when you are logged into Xbox live on your xbox.