More than 1,000 letters, dating back to last March, were found by federal authorities searching his backyard last week.
Members of the Bellmore Fire Department said they witnessed the man over eight months carrying bags to a shed in his backyard, which happens to be feet from the windows of the fire house.
The postal worker, Richard Schaaf, appeared in federal court in Central Islip Monday afternoon.
He was assigned to the Bethpage post office.
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