Its not likely that any damage was done to the engine, but the suspension may have taken some abuse as you stated. A few years ago, I had a 6.3 stolen and they found it ditched on the side of the road--driven over a small tree!! Needless to say, the suspension was all in shambles after the tow truck pulled it out of the ditch (and off the bent tree trunk). I'd get it over to your MB dealer and have it checked out ASAP before you start munching tires, etc..
P.S.--How exactly did they get the car running? Can't hotwire a diesel.
'67 250SE Cabriolet
'93 300E 2.8
[This message has been edited by Aaron (edited 10-07-1999).]