questions about dash & trunk electrics

[terryo]

i'm a new Australian owner of a 2004 X5. I got the car at auction, stolen/recovered. I've got it going OK and seems good mechanically, but I have wiring issues to solve . I'm a professional mechanic so in can read circuit diagrams etc

The stereo unit in the dash has been stolen and the wires cut.
can anyone help me identify if it had a navigator in it??. It has been suggested by other threads, that because it has a hinged lid at the top, this is the basic stereo system. OK???

also, whatever was bolted into the compartment on the left side of the trunk has been taken. from other topics, i can see that this is where the Navigator DVD lives. There is an amplifier or such right down in the bottom of that compartment, and it seems intact, but is an unused blue plug and a handful of cut wires. again, any clues would help

on the right side, all the fuses and relays seem intact, but there are screw holes where something was fitted, and a unused blue plug down near the floor. what goes into this??

In the tire well, there is a white plug at the front and a black plug at the rear...what goes into these??

thanks a lot, Terry