Sixto nailed it. .."You shouldn't leave it to anything less than an extensive personal inspection". I might add: "or a PPI by an MB dealer at your expense of course."

My '88 124 coupe was only available because the previous ebay auction high bidder flew to FL from PA looked the car over, found a few scratches, remarked " the car isn't in perfect condition", hopped on the plane & flew home!
I had it PPI'd by MB dealer in Tampa. Cost about $200.00 or less (probably 2 hrs or so tech labor rate). Seller & I resolved a few issues as a result and I flew down check in hand and only after driving and inspecting it on a lift and in the sun did I part with any money! BTW I also did a buy it now purchase. Seller did offer to let me off the hook if I wasn't completely satisfied, which I was, and as approach 70000 on the odo, still am !

Caveat Emptor mate , and good luck with the car