Would you want to be in their shoes?
Down side: the finders have all the time in the world to run the keys against a Brutalis box.
Up side: HEY A FREE USB KEY -- DARN IT'S ENCRYPTED -- FORMAT -- MINE!
That was shocking, as well as amusing. The last sentence there was 'The MoD insisted: “We take security extremely seriously and have robust procedures to deter and prevent losses and thefts."'
The party issuing that statement probably had trouble keeping a straight face.