I tried the method spelled out here for my latest batch of "Your USPS package has arrived" texts, but the phone numbers (example: +63 936 631 6676) just give an "invalid number" response. Not unexpected.
Every official channel seems to be failing us on this one. Spam calls still exist, spam texts still exist, and even fake government websites still exist. I don't understand why a .com site like https ://usps.com-helpnk.com/ is still up.