Bolt a metal plate [say 4" square or whatever] to the top, link a chain to it, chain goes through inside of box to the bottom and through another metal plate - fit good quality padlock.
I fitted a Fiamma Cargo Back to my first van. It is basically a large canvas bag. All I put in it were bulky items like a couple of chairs and bedding. Nobody nicked anything despite it only being zipped up.
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