Special Agent Scott Balfour says it took three mail trucks to remove the letters. The carrier worked in the city's Bustleton neighborhood.
Balfour says some of the mail dates back to 1997.
Postal officials say they recovered the mail on April 28 and it was being delivered to customers this week.
Balfour wouldn't comment on what prompted the investigation but says the carrier hadn't been to work since February.
Postal officials haven't identified the carrier. Balfour says they're still trying to find the man so they can question him.
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