In all honesty, you can call directly to the USPIS postal police (postal inspector). The actual police force does investigate postal crimes at their centers and mailboxes, including roadway house mailboxes. I would suggest you have your list of dates/times/copy of email/texts ready to hand over to them. It can't hurt. Nobody will get in trouble unless that nobody is actually doing a crime. It very well could be that they are just one more bit of evidence away from solving a problem, like it takes several complaints before they go to the expense of installing a hidden camera and a tracking device in fake packages to see if they actually arrive.
Up until the 2000s, inside a mail service center, the system did have catwalks with one-way glass looking down throughout the center. numerous people were assigned to monitor mail service employees from above. This was in the days of checks in the mail. Video was around, but was the size of a boom box and was obvious.
And yes, the postal inspector is a position, not a single person with a monocle.
