If I were to view a potential car around 3years old that didn't have MBFSH or known MB independent FSH (that excludes 'Bob's German Car Specialist Garage'!) , then it says to me many things - primarily the owner is trying to take a cheap route on ownership, in which case has the car been properly looked-after and what issues may later arise? Cars that have regular touchpoints with a dealer in the first 3years get recalls done, software updates carried out (critical now with the amount of tech) and inspire a far higher level of confidence when buying used and chances of clocked mileage are reduced. Add to that any work outside of warranty will get higher chances of goodwill contribution from MB. I know there are always exceptions to the rule but this is this my opinion.