In Germany (for Mercedes) and Sweden (for Volvos) they have teams of factory accident investigators who go out on serious calls to check out how "structurally challinging" accidents affect the cars. this is to help them improve them in in the future, and to see how what was in place performed.
The investigators always explain they are at the scene to investigate the car not their occupants, and privacy is strictly maintained, so they can sometimes get a more complete story.

It is stressed they have "nothing" to do with the police, so therefore no self serving stories are told. (Driver of a high speed C class told the Police he fell asleep, but told the MB investigator the truth, he had been drinking)

There was an interesting story about these programs in Car and Driver I think, some years ago, but it doesn't exist in the USA if I recall correctly

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)