I suppose a good starting place is to determine if the car was ever in a crash. Inspect the x frame underneath, looking for damage points. After that inspect the inside of the fenders, looking for patches and rough spots. Also look for abnormal tire wear, or too many / few shims, or even adjustments made at the max limits. That way you can see what part could be out of spec. Door hinges wear, that’s to be expected, and fixed with some persistence. The trunk is a bit concerning. Is it the lid or the body. Take some measurements left vs right and see if you find discrepancies. Bonnets can easily be twisted if not lifted from the center. Set the lids on a flat surface and check to see if they sit the same left / right.
That’s a start.