Back to your OP topic.
Thing you should check:
Body structure especially welding points.
Weight of each door. If they are varies, BAD.
Fluid leaking under the car, especially near exaust and DS under body.
Spare tire storage area, check if there is any water (even if dried).
Suspension.
If you are unfamiliar with car, as a condition of the sales, have the car inspected by a mechanic of your choice.
Use AutoCheck AND Carfax. Most insurance companies use Autocheck to check for prior damage before paying for Coll repair.
Based on personal experience, when I checked my 99 ES300 against Carfax and Autocheck, Carfax missed a minor accident that Autocheck found.