I'm only aware of accidents as far as obvious damage from the previous owner. I don't think there was anything on the carfax when I bought the car five years ago.
The front bumper is still black ABS so he was in some accident requiring a new bumper, and the rear bumper's paint is a little cracked from backing into something, but not major accidents as far as I can tell.
However, my tank developed a crack at the location I mentioned, and then I picked up a tank from a guy parting out his 96 240sx and it was showing signs of forming a crack in the exact same location.
I'll be ordering a new tank on Monday. $500
Edit: My car is entirely stock aside from 300zx brakes up front and braided lines at all four corners, and I've been in zero accidents.