The Halo: Combat Evolved Xbox was a limited edition model of the original Xbox released in Europe in 2001. The only method of obtaining this model (at the time of its release) was at a contest celebrating the release of Halo: Combat Evolved. There are only two known variants of this Xbox: one in green and one in orange. Supposedly, only ten of these models were made.
Halo: Combat Evolved Anniversary - Wikipedia
Xbox (console) - Wikipedia
All Limited Edition XBox Consoles - Rare and Uncommon Xbox Hardware
Destiny - RPCS3 Wiki
Halo 3 - Wikipedia
Halo: The Master Chief Collection Guide - IGN
Halo: Combat Evolved - Wikipedia
Halo 4, HaloHistory and Gaming! Wiki
Halo: Combat Evolved Microsoft Xbox Game
Xbox One Limited Edition Halo 5: Guardians Wireless Controller (Renewed)
Halo: The Master Chief Collection — StrategyWiki