Did he provide the VMI report or did you get it? ( The VMI is a internal MB confidential document so don't tell the dealer or MB you have it. )

It shows a AC evaporator being changed in 2008 at ~ 60 k miles . I would not call that the entire AC system. And, . . the car is now at 130K.

Did he buy the car new?

How long has he had it? ( then ask to see the title just before the deal goes through to see if the story matches. )

Was the car always driven in Florida? If it made regular trips to salty areas that is just as bad as a Northern car that made trips to the South. ( look at the underhood aluminum, if fluffy white, dull it has seen salt. )

Try to find out the name of the dealer is was purchased from. ( dealer # 15309 )

Run his contact info through Google and see if any other cars for sale pop up. ( This weeds out unlicensed dealers posing as owners )