Pitbull
Verboten
Definitely went through the USPS...
That's how we got a return to sender for Eric Holder at Debbie Wasserman Schultz's office. Also, the bombs to Obama and the Clinton were picked up at a Secret Service mail sorting station. The one for Waters was intercepted at congress's mail sorting station and the one they picked up at CNN made it all the way into their mailroom.
I don't know much about the Postal services in the US. But there are claims that if it came through the postal service, the packages would have been stamped. Stamps are lacking from those parcels apparently.