Over the years I've been acquainted with a couple of people interested in the E&P/EN and have done reading in various archives on their (and my) behalf.
What comes to mind about the #12 is that it was offered to other ng properties after the Eureka-Nevada was abandoned. And the former manager, after moving to Carson City and taking on a job in the state administration, reluctantly represented the Boston owners of the E-N regarding the locomotive. Story is that he and a buyer went out to Palisades and found the engine missing -- Dobby Doc (the "Las Vegas character") had struck.
Brian Norden