[Q] '93 90S trunk won't open

[Ed Skladany <eds@pluto.njcc.com>]

Hi,

I'm posting my problems separately so the threads can be distinct.

The trunk on my newly purchased '93 90S won't open.  I only have one
key and have verified with a dealer that it is a master (non-valet) key.
The trunk also does not unlock with the central locking system.  The key works
in all other locks on the car. 

The key doesn't turn in the trunk lock so I suspect he had the cylinder
replaced and lost the key for it.

The seller swears he opened the trunk just before he showed it, but as
I said in my last post, all signs point to him being a liar.

Since I'm trying to get into the trunk without: A) calling a locksmith,
or B) calling a "professional", I thought about going through the
pass-throughs in the rear seats.  The problem is, they won't budge either.
I squeeze the release latches on either pass-through, and they won't move.  
I've pulled back the upholstery and can see the lock box, but there's
no visible sign of a locking mechanism.

Are these pass-through latches locked by the central locking system?  How?
Is there a trick to getting them open?  Or fixing the power-locks for
the rear without getting in the trunk?  

I'm also missing the owner's manual, but one's on order.  That's why
some of my questions show a lack of owner's knowledge.  Sorry.

Thanks,
Ed Skladany
'93 90S
'84 4000S