AutoPage RF 503 removal?

Hello all.

One of our fleet vans (Chevy 2000) was broken into. In an attempt to silence the AutoPage RF 503 the theives pulled the wires from the back of the relay cluster under the dash. (where the valet switch is located)

Now I am faced with having to tow the vehicle because of what I believe is the starter interupt. I am the third mechanic to be assigned this van and the remote is long gone. I didn't even know it was a alarmed until it went off one night lol. The theives gave up and ran off but now I'm stuck with the thing in my driveway.

I am a mechanic by trade (heavy equipment) and all my tools are in this truck. I would rather just remove the alarm and deal with another one later than have it towed. Is their an installation manual available for this alarm?