CHICAGO (CBS) — Postal inspectors were investigating why more than 600 pieces of mail were dumped in the trash in the North Park neighborhood last week.

The inspector general’s office for the U.S. Postal Service said a resident found the undelivered mail in a trash bin on Thursday near the intersection of Drake and Thorndale.

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All of the mail was addressed to the 60659 zip code.

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“When I found out from my neighbors that no one received mail for two days, then I started realizing things that I might be missing that I’m expecting to come in the mail that still hasn’t come,” said North Park resident Sarah Waddell.

The Postal Service said all of the mail that was found in the trash was correctly delivered over the weekend.

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An investigation has been launched into who dumped the mail in the trash.