I have installed the red & orange wire in its place.I believe that would indicate where the empty spot was? No? Is this any clearer? If not let me know and I will will try to be more precise with my words. Im just wanting to know if its left by the factory like this or not.
The spots for the fuses should be marked on the under side of the lid to the box. What does that say? If nothing was meant to go in that opening, it should say "spare".
FYI, rather than splicing into the fuse panel like that, there is already two accessory pig-tails with connectors that come off the wiring harness. They are under the subframe near the rear brake resevoir. These would probably give you a better place to get the 12vdc from. BTW, what did you use the power for?