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Detective riddle

A courier was found dead in an alley with a briefcase handcuffed to his wrist. The briefcase had a digital countdown timer locked at zero, but it had not exploded; it simply emitted a high-pitched tone. The combination lock was set to '0000'. Detective Hayes opened the briefcase easily and found it empty. What was the purpose of the briefcase?

About this riddle

Detective riddles are tiny mysteries. Look for the detail in the story that does not fit; it is usually the clue that solves the case.

Difficulty: Medium. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.

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