BS!!
The Wisconsin authorities turned the trays over to the USPS. The USPS DeepStaters will do nothing.
The local USPS office will know exactly which mail carrier it is by just giving the addresses on the mailings a quick look. That carrier will most likely be immediately fired. At least that’s how it would have worked in FL and MO when my wife was a rural mail carrier. Wisconsin? Who knows. Being that it made the news, I would think that mail carrier is unemployed today.