One of the current advantages we enjoy is a monopoly on the mailbox. No other courier may use the mailbox for delivery, nor can any other matter without proper postage be put in mailboxes.
Yet, every day, carriers encounter pizza coupons, garage sales, community picnic announcements, newspapers, thank-you notes and many other items deposited in mailboxes.
It's actually federal law that allows us this monopoly. The U.S. Code 1725 sets the fine as $300 for each offense. And the DMM 508 tells us as a minimum, we should collect the postage that the item would have been charged.
What's the most interesting thing you've seen in a mailbox? And what do you do with items without postage you find in boxes? Comment here.