You should take the car to a body shop. Mine was rear-ended once; as we examined at the accident site everything looked OK, even no scratches, but back home we noticed the rear doors were not in flush with the heck indicating slight frame deformation. Later the bill was about 900.- paid by the other insurance.

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE