Missing streetcar in the Upper Peninsula

I keep a list of "mystery cars," most of which appear to have been preserved at some point but then dropped off the radar. One of these is the car pictured here: Marquette County Gas Light & Traction 15.

I'm not sure who built it for MCGL&T, a small streetcar line that ran between Ishpeming and Negaunee in Michigan's Upper Peninsula between 1893 and 1927. It may have been purchased secondhand. But it was in existence as recently as 2014 according to this newsletter (PDF) posted online by the Negaunee Historical Society. At that time, the car was said to have been moved from a previous storage location outside the Negaunee Senior Center to a "temporary storage" site. A 2010 forum post here provides additional information, including the car's fleet number: 15. The post also indicates that 2010 was when the car was moved from the Senior Center and claims that it was moved to the Tracy Mine, an abandoned mine east of Negaunee. Google aerial images and online "urban explorer" photos show some pretty impressive extant buildings at the Tracy Mine site but no sign of the streetcar. I've tried contacting the Negaunee Historical Society but without luck.

So, anyone know what happened to MCGSL&T 15? Is it still at the Tracy Mine site, possibly even stored inside one of the buildings? Or was it demolished or otherwise lost during the last seven years?

EDIT: This car has now been added to the PNAERC list, but not as a MCGSL&T car! See here.