Mailboxes for Outside 17.3Mailboxes for Outside 17. 3 Product Features Multiple Anti Theft Protections Don't worry about losing keys and being unable to retrieve your parcels. VEVOR 17. 3" x 13. 8" x 22. 8" mailboxes for outside come with a secure password lock and internal hinge to ensure your packages are well protected. The deposit opening is also equipped with a large anti theft baffle, reinforced screws, and hydraulic support poles to prevent theft and shock absorption.