And police say the theft was caught on store surveillance video.
Officers later arrested the suspect, Thomas Medeiros, 63, of Wareham, while on his postal route in Taunton. He was charged with larceny from a person.
Around 7:40 a.m. Saturday morning, Wareham Officer Calib Larue responded to the Cumberland Farms on Main Street for a larceny.
At the scene, the victim told police that around 6:50 a.m., she put her purse down momentarily on a counter and walked to the back of the store.
When she returned, she was about to make a purchase and realized that over $60 in cash had been stolen from the purse.
Police say store surveillance video showed a customer in a U.S. Postal Service uniform had reached into her purse and taken the money.
An investigation found that the suspect was an employee of the U.S. Postal Service assigned to the Taunton area.
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