Yes. I know of 4 confirmed at or above the higher amount you mention, since 2016.
I think there well be others, but not at a confirmed sales price.
There are many more non-supercharged cars that were sold way above your price window, so the price ticket of an S/C car will not always be simply a function of the 'charger anyway.
For sure. Lots of factors account for a cars value. Mileage, condition. As you say some non SC cars have sold for more.. from what I've seen they were super low Mileage and great condition.
I'm half tempted to find the cheapest v8 I can and gamble on doing an SC install from scratch despite being advised that it isn't as easy as tuning a mustang.