It appears scammers are sending fake USPS text messages from telephone number 5034079821. I will update this post as I get more information. But, typical USPS scams involve scammers attempting to trick their potential victims into visiting the phishing website that steals account credentials, personal and financial information.
A USPS Text Scam Sample

If you have any information or have received text messages regarding telephone number 5034079821, please leave it in a comment below.