With a new episode of Spartan Ops released, more pieces of code have been released.
There is at least one code (probably a lot more) still out there. Hasn't been cracked yet. But they're close. Word has it that it unlocks the GRD/BOB helmet for Reach.
If anyone hears about it, post to this thread to keep the community updated.
Retail 1000 (No DLC):
Halo: Reach (1400)
Resident Evil 5