Heh, stories of neat, organized thieves always interest me. A buddy of mine had his car stolen a year or two back, the thief ended up leaving the car in the desert and just taking the stereo + speakers. Did a really neat job, properly disconnected everything, and even took the speakers out without tearing anything up, which is pretty difficult since I think the speakers had to be installed from the trunk, causing your body to twist in some contorted manners to get to it.

Anyways, if you still have the stock fader and speakers I'd use this as an excuse for all new speakers and just run your own wiring. It's pretty simple to do properly.