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The only know useable chest on Black Ops is the cheat to access the bonus zombie game mode.
1. When at the main menu (Where you are strapped in a chair and there is monitors surrounding you) look down at your arms
2. Alternate quickly between pressing left and right trigger
3. You will break loose. When you stand up walk around the room until you spot a black terminal against the wall
4. Go to this terminal and select A
5. Using the keyboard enter in DOA
6. You have just unlocked Dead-Ops Arcade game mode
Other than this, xbox doesn't allow any in game cheats, and may only be useable for PC.