> A sends their open padlock and a box to B And they are both promptly stolen, because neither is inside a padlocked box. "anything sent through the mail will

> A sends their open padlock and a box to B And they are both promptly stolen, because neither is inside a padlocked box. "anything sent through the mail will be stolen unless it is enclosed in a padlocked box". Anything includes padlocks and boxes. In fact, even the padlocked box would be stolen because it's not inside a padlocked box. And if it were, the outer box would just be stolen. The puzzle as written is just turtles all the way down. The proper form of the riddle would be that anything except for a padlocked box will be stolen from the mail.