Try reporting it directly to the US Postal Inspector. From: https://www.uspis.gov/news/scam-article/smishing-package-tra...
> Have you received unsolicited mobile text messages with an unfamiliar or strange web link that indicates a USPS delivery requires a response from you? If you never signed up for a USPS tracking request for a specific package, then don’t click the link! This type of text message is a scam called smishing.
> To report USPS related smishing, send an email to spam@uspis.gov.
> Without clicking on the web link, copy the body of the suspicious text message and paste into a new email.*
> Provide your name in the email, and also attach a screenshot of the text message showing the phone number of the sender and the date sent.*
> Include any relevant details in your email, for example: if you clicked the link, if you lost money, if you provided any personal information, or if you experienced any impacts to your credit or person.
> The Postal Inspection Service will contact you if more information is needed.
> Forward the smishing/text message to 7726 (this will assist with reporting the scam phone number).