2nd non-ducted A/C ceiling unit (or portable?)..questions...

Ok, look what I found. This is the junction box inside the closet right next to the vent hole where the schematic says the optional A/C is. Does this mean the wiring is all ready to install the 2nd A/C? I'd rather not remove the caulk and everything to look -- oh, maybe I can remove the bottom part and access the wiring from there...to look? -- Seems to me this is ready for a 2nd unit. That's good news. And now I have the info I need to get the right one as well.