Thanks for all the replies. I appreciate everyone's thoughts!
So I did take the car for an inspection. I don't know a lot about cars, but the mechanic spent 4 hours examining the car (I watched and had him explain everything to me). Here is what he found/didn't find:
Chassis, frame, and all parts underneath the car look straight and fine, nothing uneven, everything straight, no evidence of any major repairs.
Back: there is evidence of back bumper replacement, as one nut was missing under the car where the bumper is held on (although the mechanic said that didn't actually effect anything) and one small area underneath the car had a bit of paint overspray, which was the only evidence of any repair underneath the car.
Back hatch has likely been repaired or replaced (which we already guessed) as one bolt on the inside is not painted, and the painted ones appear to have tool marks on them from being removed and then put back on.
Sides: No evidence of any damage to either side.
Other/maintenance issues (and non-issues):
1. Back windshield wiper is out of adjustment.
2. Front wiper blades in the front need to be replaced just because they are old.
3. One brake light is out (taillights work, but on one side when you brake the light doesn't get brighter).
4. Fluids are all good, no leaks
5. Tires, rotors, brakes also all good
6. He used a tablet-looking-thing to scan all the sensors (hope I am describing that correctly) and everything passed, no airbag issues or anything else.
7. Engine fine, no problems, all the wires are connected, etc.
Overall: He said overall the car is in great condition, no evidence of any structural repairs, (unless you count the tailgate as structure...?), all panels and parts straight and even (not hammered out or evidence of having been crunched and re-straightened or whatever) no evidence of cheap replacement parts, no parts underneath that look newer than other parts (accident was in November according to Carfax, so replacement parts would likely look newer than 2015 parts would) just cosmetic repairs (back bumper/tailgate/front headlight) that were done very well, and if it were him, he would keep the car.
I am working on my decision but leaning toward keeping (after making carmax adjust my wiper and replace the brake light). It is the exact car I have been looking for forever and about $1000 cheaper than similar cars at Carmaxes in California (maybe due to the accident on the carfax?). But I am still thinking about it and appreciate any further thoughts before I decide!