Just a throw it out there comment,mopar offered an EVS security system as a dealer add on. In the older models it was a EVSI and in later ones a EVSII. Maybe its an early version? I have a almost complete EVSII system in a box but it doesn't have a "key". Does have a shock sensor though. It lacked the module harness which mopar in all the wisdom sold seperately and is no longer available.
deep from the bowels of mopar design
Links to axle rebuilds, mount replace,a/c box rebuild,ect in history section of my profile page