The TU's on Xbox Unity are incorrect for Perfect Dark 584109C2.
This is what they should be:
TU #1:
TU_1C422E2_000010C000000.00000000000G3
TU #2:
TU_1C422E2_000010C000000.00000000000O3
TU #3:
Missing
Here's the changelog: https://tcrf.net/Perfect_Dark_(Nintendo_64,_Xbox_360)/Version_Differences#Title_Update
Easiest way to tell is to see if there is a "Gamma" slider in the video settings.
I've been looking everywhere, and I can't seem to find the update anywhere, all the other ones are the 3/17/10 version, when the latest is a month and a half newer (from the beginning of May 2010).