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Go to Home Depot and get a Masterlock key box.
They also make one that doesn't have the outside loop, it screws to a flat surface, that's what I use. It bolts to the license plate holder. You just have to get Sharkb8 to make you a bracket.
My original 'unhackable' solution was a plain metal 'surf key' without the electronic part. But after I lost it, honda dealer tried 4 times and could not reproduce my original surf key that has worn down the door lock just right. The fresh keys do not work with the lock anymore. Hence lockboxSearch Youtube for hacks on any above locks. Shocking and entertaining