Police were called to the Orchard Park Post Office after a customer heard a ticking noise coming from a mailbox outside the building, according to the Greenville police.
The Greenville County Bomb Squad was called in to survey the situation, police said.
The police said they don't think it is anything serious but they are taking precautions.
An official with the U.S. Postal Service said there was nothing suspicious found in the drop box.
Officials said they believe the customer actually heard a ticking noise coming from a nearby flag pole.
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