The anonymous thief would listen through keyholes in homes in Antwerp, Belgium, to see if anyone was in, before breaking into the properties.
But although he may have thought he was being cunning, he was actually leaving prints on each door - which turned out to be enough evidence for the police to find him!
And it's not the first time that robbers have been busted after leaving traces at the scene.
Recently, one chap stole from a café, but was caught out after munching a mince pie and leaving his DNA behind.
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