Speaker location diagram

[GOB]

I have a 2003 Cayenne Turbo with the PCM option and Bose speakers. I believe it uses regular speaker wire and not MOST, but not sure. Yesterday, while digging around the trunk, I took the rear left side panel off and saw a speaker (perhaps 4" or 5.25") just dangling! Took it to the dealer and they are lost since they state that vehicle should have never had speakers there to begin with. I find it odd that Porsche would perforate the plastic in a manner that would lead you to believe there is a speaker under there. There is a speaker on the right side in the same spot where the left one is dangling. Can anyone please confirm for me which are the speaker locations for my truck, particularly from the rear doors back. Apparently I don't have the sub underneath the spare, something I thought was stock. Any help will be greatly appreciated.

[GOB]

Enclosed are some pics of what I have now. Appears to be a factory install of the sub (wiring at least, minus the enclosure in which it theoretically goes). Recall that I do have the spare tire and the second battery option in the truck. So if those two things are there, where does this speaker go?! Side panel shown? As is right now, it has been just "thrown in there" and the previous owner claims he never touched the stereo (no reason to doubt him). I just want to have the local dealer put this where it belongs and how it belongs before my warranty is out!