We had same story, USPS lost daughter's green card. But it finished successfully finally, with help of newspaper's reporter and senator. USPS returned back $105.42 (delivery fee and insurance) and USCIS returned $575 paid for temporary entry permit. Story described there
When USPS loses your greencard
in Working & Traveling During US Immigration
Posted
We had same story, USPS lost daughter's green card. But it finished successfully finally, with help of newspaper's reporter and senator. USPS returned back $105.42 (delivery fee and insurance) and USCIS returned $575 paid for temporary entry permit. Story described there
http://eteriosoft.azurewebsites.net/desc.html
https://www.fosters.com/news/20190721/missing-green-card-imperils-familys-immigration-quest