If the tar plate is still stuck to the inner side of your doors' skin/panel, you can do nothing else but tighten all the bolts and screws again.

If the sealant/kit on the door is smooth, the inner side of the door skin/panel does not show any sign of dents, hammers, or other tools used to reshape the door skin again, I doubt that the car has been in an accident. Maybe the surface of the door was repainted because of a scratch or something minor like that.

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)