I would open a case with the USPS Inspector General https://postalinspectors.uspis.gov/contactUs/filecomplaint.aspx https://postalinspectors.uspis.gov/contactUs

I would open a case with the USPS Inspector General https://postalinspectors.uspis.gov/contactUs/filecomplaint.aspx https://postalinspectors.uspis.gov/contactUs/filecomplaint.a... This seems like it would be considered mail fraud, and as UPSP was used they have jurisdiction to investigate it. I'm not sure how serious they will take the case however.