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.
Links to axle rebuilds, mount replace,a/c box rebuild,ect in history section of my profile page