I seem to remember that the MB rust warranty relies on the car having a full MB service history. It was put in place to reassure buyers that the corrosion problems MB cars were experiencing for a few years in the mid-90s (due to cost-cutting and new paints that were not sufficiently weatherproof) had been resolved.
If the car doesn't have a full Merc dealer history, you've no chance of being able to claim anything.
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