This mailbox is very well designed. The only thing that can break in to steal your mail is an octopus. After a spate of mail thefts in our area, it's time to stop them. I attached the box securely to the crossbars of the rack with 3/4" x 9" and 1/2" x 14" hardwood backing with square head screws/nuts/5/16" x 1" and 1/2" (L). Washers. I drilled the liner into the crossbars with a couple of 2" and 3/4" stainless steel deck screws, then secured the box to the liner with carriage bolts. Once you tightened the square head screws, you're good to go Nest in the bottom shelf of the box and basically go flat - the box isn't going anywhere - the box keys are inserted upside down (just a tip) and will take a few cycles to go in smoothly when new.
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