Actually the wires in question appear to belong to the rear speaker. They ran behind, but not to the high mount brake light.
And the orange wire probably had a red stripe I wasn't seeing.
Either way, I'm gonna have to run some power up from the dash for my map lights to work as I want. I was just hoping I only had to run wire through the headliner, not the dash, A-pillar, and then headliner.