World Trade Center mail
The Postal Service said the mail is probably from companies who have not updated their mailing lists. As a result, the post office has accumulated stacks of mail addressed to people who used to work in the towers.
Officials say most of the mail will be returned to the sender, while some will be sent for shredding. The WTC, which used to have its own zip code, collected more than one million pieces of mail each week.
Shown above a returned to sender handstamp collected from the World Trade Center. The stamp was last used on September 11, 2001, the day of the attack on the World Trade Center.
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