It happened near the 700 block of Washington Avenue in Vineland just before 11:30 a.m. on July 3.
Authorities say the USPS worker was attacked and robbed while on the job.
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The U.S. Postal Inspection Service posted a photo of the wanted suspect.
A $50,000 reward is being offered for information leading to the arrest and conviction in the case.
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Anyone with information is asked to call the U.S. Postal Inspection Service at 1-877-876-2455.