Located at least one issue. The 100 AMP fuse to the rear SAM was blown. The rear SAM controls almost everything in this car outside of the engine bay.
It was quite a job to get to the fuse. The battery has to be pulled which is located under the passenger front seat. To get at the battery, the passenger front seat must be all the way forward, which it was not. And nothing working, so I tried to pull the front seat, but did not have success- this is a real big design flaw, as one can't get to the battery and pre-fuse compartment if the front passenger seat is not functioning.
I checked the incoming voltage at the rear SAM, and it was zero. I placed 12v on the rear SAM, and was able to move the seat. forward. Nothing else worked, but what I needed to work did. I moved the seat forward and pulled the battery. This is the hardest battery I can recall trying to remove. I saw no signs of anyone trying to get under the passenger seat prior to me.
Measured resistance across the power distribution fuses, and the rear SAM fuse was blown which is what Mercedes call a "fuse strip". Hopefully Mercedes has these fuses in stock.
Of note, the car is super clean. No rigging of any nature, everything OEM everywhere. The CARXFAX showed this car had extensive and continual preventative maintenance at the MB dealership. One example, two transmission fluid exchanges were performed under 100k miles.
Either this car has something really wrong, and it is a insurance fraud case, or someone stole a really nice car. Hope to have better understanding tomorrow after the fuse is replaced.
I can't get a trailer to where I live, so I have to work on the car about seven miles away from home until I can drive it home. Very inefficient not having tools close by.