Stuff happens I guess. I was clearing a mail box one night and one thing we did was put an empty mail bag in the bottom of the box, this did two things, if it rained then it kept the mail above the water if the box leaked and if you ran out of bags because the mail was heavy you could grab one out of the box. I had been looking at one box for a while and thought the bag needed to be changed as it was a bit grotty so I dragged it out and somehow an express envelope had become hidden in the folds of the the bag it and was some years old, it was a job application and I always wondered how the person got on. I took it back to the mail centre and let them deal with it. We were all talking about after work and no one could even conceive how it might have happened but it had. It was quite common when part timers were working in the system such as Christmas time to find that bags had not been emptied properly and this was caused because they had never been shown the correct method to ensure it was empty.