Tesla Motors Club

Been looking for months for a used MS with AP2 sold direct from Tesla using ev-cpo.com. I have had no luck finding a car matching my requirements, so started looking elsewhere. I've been talking to a Mercedes Benz dealer about a 2016 MS 60D they have on their lot, and will be making a two hour drive next week to see it.

My question to all of the experts in this forum, what should I look for when I see the car beyond the normal stuff on an ICE car (i.e. tires, brake pads/rotors, body condition, interior condition)?

Some things I've thought of, along with some more questions:

1. Degradation of the battery. (How can I tell?)
   
   
2. Was the battery upgrade done to 75 kwh? (From that the dealer told me, I don't think so, but want to confirm, but how? Will it state "75D" on the display and/or MCU?).
   
   
3. Does it have AP, EAP, and/or FSD software installed? (Built Nov 2016, and I've confirmed it has hardware v2 via the number of cameras, but how do I check for AP, EAP, FSD?)
   
   
4. Does it include free supercharging? (I've read a lot about when that was discontinued, but have read it was based on the build date, others say the delivery date, still others say order date. So how can I tell by examining the car itself to determine if it has free supercharging?)
   
   
5. Should I request it be taken to a Tesla service center to be checked out? Will Tesla even do that since being sold by a MB dealer, and what might the cost be (if anyone has ever done that)?

What else should I be looking for?