I have been doing this there are many tuts on here. Have your profile and game save on hdd copy your game save to USB. When you game make another acc. Join your on game and save on USB. Use horizon open both saves copy your info to second acc rehash and sign. Now that second acc. Is your same level inject the 255 golden key in second acc. And rehash. Now go start your game nomal with your profile then join with second acc. Go open chest with second acc and use your main acc to collect goods sell guns you don't want and don't save on second acc. Just back out and you don't lose any of the 255 keys. Repeat as mush as you want and move second acc in levels as you do. Sorry I did the best I could I know there's better out good luck.