[sp332]

No idea how this works in other places, but in the USA, messing with someone's mail or mailbox is a federal crime.

[dave5104]

It may be a crime, but an unlocked mailbox still leaves the temptation there.

[riquito]

Cool, so I suppose you don't use keys for your car neither. Convenient

[sp332]

First, stealing a car or stuff out of a car isn't a federal crime. Second, I almost never lock my car, but that depends on the neighborhood.