The lock bolt is in the mailbox does not always withstand the encroachment of the feeder bullies. Too primitive its form is thin and the iron from which it is made.
But if you replace the stock bolt with steel plate cross-section 20×3 mm, bent as shown, so just the box, no one will open.
Recommend to read
MIXER WHIP UP
Anyone who self built a house, garage, cottage, etc., knows that the most difficult stage — zero cycle (the Foundation) associated with the preparation of a large number of concrete mix...
BUSH KITCHENETTE
Offer a kitchenette allows you to prepare food in field conditions in any weather. Particularly suitable for hikes of the day off, as "no axe": runs on dry fuel sold in sporting stores...
