They’re hunting for Reach easter eggs and possible ways to unlock a Legendary ending — which I’m all for — so this is my contribution: a third BOB on The Package, near the switch that triggers the cutscene and data pad #8. It’s hard to tell it’s a gold Ranger given the lighting, but it does disappear after a while — but most likely before you’ve cleaned out all the invisible Elites in the lobby — so I think it is one.

Although IMHO this isn’t necessarily a third BOB, but just a replacement, or another possible spawn point for BOB on this level, since I didn’t get one in the courtyard during that run.