Not extensive Autopilot data, but basic vehicle state attributes (speed, throttle, seatbelts engaged, etc). All vehicles have this black box (event data recorder) in their airbag subsystem.

There have only been a handful of Tesla accidents while autopilot was engaged where the vehicle was catastrophically damaged, so it’s a bit of an edge case.

https://www.edmunds.com/car-technology/car-black-box-recorde...

I’m pretty sure they store far more than your standard black box. This guy was pulling video (and seemingly more) of crashes off Tesla computers from salvage cars: https://twitter.com/greentheonly/status/1329499639402389506

"Not extensive Autopilot data" -> This is false. The car not only records extensive Autopilot data when it crashes, it also records video.