Based on everything you've posted and the info on the dealer website, it appears to be a fair deal. My thoughts:
1) I'd expect Tesla to list that car around 62K in their CPO program.
2) The interior wear you pointed out above is a common wear point as mentioned by others. You can have this repaired. Tesla could most likely replace the part at a cost. However, a good leather repair shop will make that spot disappear with no color match issues. Call Tesla Marietta and they can probably send you to a someone they recommend. Btw, Greg at Tesla Marietta is awesome. He'll often be the one answering the phone when you call the service number.
3) Obviously charge the car and check the battery capacity but also keep the warranty in mind.
If you can't charge the car all the way up, you can calculate the miles based on the "miles" (rated - do not use "ideal") and the percentage readings.
Brand new, the EPA number for that car is 265 (miles). However, you're not going to get that number except in ideal conditions with a light foot. Also, unless the car has recently been drained to single digits (percentage) and then charged fully, the miles calculation may be off a bit (lower than actual).
If I were buying this car, I'd be happy with a rated range of 255 miles or higher (knowing the calibration is likely off). However, it'll probably be a bit higher. Based on the number of miles, I'd expect only 1-2% battery degradation as long as it hasn't been left at 100% for long periods.
If the car is charged to 100% when you arrive at the dealership, ask how long it has been at that state of charge. If they charged it up that morning for your test drive then that's fine. If they've kept it on a charger and had it at 100% for a month then I would personally want the battery drained low and then charged all the way up to see what the rated range is after a calibration.
Basically, these batteries last a lot longer than you would think as long as they aren't abused.
4) Before driving off with the car, make sure the mobile charger works.
5) Keep in mind that the 12-volt battery may not be happy if the car has been sitting for a while. If an error related to that battery pops up during the test drive, it's a likely a non-issue. Those freaking things die all the time and Tesla has gotten quite good at replacing them quickly (~5 minutes). My 9/16 model s has chewed through three of them. Personally, I plan on letting Tesla replace them like candy until my warranty expires. Then I plan on switching to something like this:
element3batteries
6) Above all, keep in mind the car is under warranty. If you find an issue, check with Tesla about getting it fixed under warranty before considering it a deal-breaker.