A new bumper cover, taillight, and blind spot sensors for my housemate's Lexus were $6k. No such thing as "small" accidents anymore.
If there was a police report, maybe? Those are public info. But you'd have to know what the license plate of the car was, at least. (Old plates still on it?)
Information reported to Carfax is incomplete at best, deceptive at worse. Take the car to a third-party mechanic for proper pre-purchase inspection (you will pay for this), ask them to check for what they think might have been the damage - they'll be speculating, but they can usually spot things like paint overspray when it's up on a lift, or masking lines from a repaint. That'll give them an idea of what body panels might have been repainted, repaired, or replaced. If they can't spot anything, then it's probably a darn good repair job that you shouldn't worry about too much.
Ask the dealer to check the alignment or provide a printout from when they did. It's not guaranteed to show anything, but if the non-adjustable parts aren't pretty close to symmetrical (and within spec) then there's quite possibly frame damage.
Also, when you have it on a test drive, spray some water on a microfiber cloth and give the car a quick wipe-down in all the places rain doesn't usually get. (inside the doors, along the bottom of the car, inside the trunk lip, etc.) Cheap paint jobs sometimes rub off. Not kidding.