How to assess damage after rear impact?

[zeroid at hotmail.com (Ben Channard)]

     While waiting for the left turn arrow on Sunday morning I was hit on 
the rear bumper of my '81 Mk.1 by a current-gen Honda CRV at an estimated 
speed of less than 5 mph.  I don't see obvious damage--no marks on the 
bumper cover; cover doesn't appear scrunched against the body.  The bumper 
struts appear to have the look of an oily darkening as if an oil had seeped 
out from the collapsable elements.  This doens't look as  if oil had just 
been forced out--it  looks "old."

     I told the CRV driver that I'd call after inspecting my car.  Where and 
what can I inspect to survey any damage that my car may have incurred?  
Which joints, areas etc.  Are the bumper struts in fact oil-filled?  Is 
there a dimension that I can measure to assay if they've been pushed in?  
Yes,  I have the U.S. domestic "park bench" bumpers (and grateful for them). 
  I'm not in full-on berserker mode but I'd like to avoid any nasty 
surprises in the future.  Thanks for any guidance, benton-----

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