I really think you're overestimating the average postal worker's sense of "duty" as well as how the post office works as a whole system. The USPS once delivered

I really think you're overestimating the average postal worker's sense of "duty" as well as how the post office works as a whole system. The USPS once delivered a postcard I sent to myself, because their system confused my "from" address with the "to" address. When I complained, they told me to go buy another stamp and send a new postcard. My postcard was crystal clear to a human, but somehow their automated system got it confused, and yet they acted like it was my problem, not theirs. This was about 15 years ago so maybe their automated systems are better now, but I don't think their "duty" or "commitment" has changed that much.