The man came across the cash in a bag on a street in Stuttgart on Monday at 12.15pm and headed straight to the police station with it.
Later on that day a 33-year-old tradesman phoned to say he had lost €18,000.
He had left the bag with the money inside on the roof of his car and drove off without realizing he had lost the cash.
Police described the 66-year-old man as an "honest finder".
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