The postal service is a mystery to me. Not just these mailboxes - the whole thing. It seems very complex. I would love to see how they sort the mail. How does international mail work? Are postal workers impressed by nice looking packages? Do they read postcards? If I saw something addressed to Post Secret I'd totally read it. If a customer is rude, do postal workers delay (or "lose") the package? I'm sure that's not allowed. How much mail is there? Do the delivery people feel sorry for customers who only get junk mail and bills?
Okay, that's all for now. Please leave comments if you have answers! I'm pretty curious today (as usual).