Which reminds me. During the early 1960's I had a job working for the local Post Office, attempting to fund my college education. At the time I didn't have a car, just a Vespa motor scooter. So I would pick up the mail for the first section of my route at the office, place it in my leather bag, place the bag on the scooter's floorboard between my legs and ride to the start of my route, where I would park and walk from house to house delivering mail. (We didn't deliver packages in those days. Just letter-size mail and magazines.) I got away with that for a couple of months and then the Postmaster happened to see me riding my scooter with official government mail between my legs and he had a fit. He said that was not only dangerous, but I was not protecting the mail securely. I thought I would get fired, but instead I was given a mail route that allowed me to walk from the office to the start of my new route. So the mail remained safe from then on.
Interestingly, a year or two later, the USPS tried using enclosed Cushman 3-wheel golf cart-type vehicles to deliver mail. That was a big fail. Not only were they not powerful enough to climb the steepest hills in our town, but they were top heavy and sometimes would fall over if you went around a corner too fast. It wasn't long after that episode that the USPS started looking for the little trucks that they are still using to deliver mail and are now trying to replace.
