Wow...Thats what I call dedication to job.
The postal staff in my part of the world regularly steal away stuff that I trade, especially coins. They haven't found any of my philatelic stuff in mail to their taste yet but they feel free to steal away coins from unregistered letters and deliver the empty envelope.

I even get airmails after couple of months from posting and for some strange reason international mails from US comes wet.

Postman of my country were even caught selling away letters to scrap paper dealers. So much for dedication.