USPS provides a staged missing-mail process. The correct step and timing depend on mail class, tracking, and the current instructions. Follow the official page rather than an old universal waiting period.
Keep:
- mailing receipt or order invoice
- sender and recipient addresses
- description and value of contents
- photos where available
- tracking history
- proof of insurance or extra service
- case and search numbers
A search request is not a guarantee of recovery or payment.