USPS® Mail SearchWhen we receive your Missing Mail search request, we will send you a confirmation email. We will also send you periodic updates about the search. If we find your package or mail, we will send it to the address you provided.
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A very small fraction of one percent. Of this most is not actually lost, but is either damaged by or becomes trapped in the massive automated machinery used to process the mail. Letter mail gets processed on multiple automated machines, usually before anyone actually even looks at it.