I had to register to do first search and then a missing mail report after the first one resulted in a missing status.
This is this the email I got yesterday.
"Thank you for using USPS.com.
USPS Tracking® shows a "Delivered" status for your mailpiece. Your search request will automatically cancel in seven (7) days. If your mail was not delivered, access your search request from your Submitted Search Requests and click Keep Searching.
Search Request Details:
Request Date: 08/27/2022
Reference: Search ID #14968929"