CyberBob just pointed out a post in halo.bungie.org's by MAK, who points out a photo taken of the Voodoo5 5500 AGP box, which can be seen here.

The shot right below the Voodoo5 text... what do you think? Kinda small and hard to tell, but since when has that stopped us? Looks very much like the jeep, headlines going full blast... quite the feather in Bungie's cap if Halo is being used as a graphics card showcase in pre beta state.