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How can I track a package that has been lost in the mail?
Did you just check online, or call the post office?
You can contact the US Postal Service and report the package lost.  The USPS will then file a report with the carrier who handled the shipment, and work to find the package and return it to you.  In the meantime, you can ask your carrier to give you a report of all packages that were lost in their system.