Let me know if it's effective - I'll 'borrow' you to work the same magic on our local postal service!
Best example of crazy postal deliveries was when my aunt in Australia posted me a birthday card 2 days before my birthday that arrived on time. My other aunt, living just up the road, posted a card 10 days before that arrived 2 days late. So it takes 12 days to move a card a few miles, but 2 to bring it from the other side of the world...