I store my keys in a Faraday box now, even the keys for my cars in the garage.
They are about 30 bucks, and I have them neatly yet conveniently hidden. Just make sure you test it as soon as you get it. The ones I bought I can have the box in my hand with the keys in it and it won't unlock the car. But other guys here at work who've bought them, they don't work at all. A lot of them are non functional.
https://www.amazon.ca/gp/product/B09...?ie=UTF8&psc=1
I'll also add, there's a lot of convenient ways to get a kill switch installed. In my F150 Tremor, I had the 6 overhead console auxiliary switches wired by a security guy in a way that they have to be in a certain sequence to engage the starter if I am parking it long term... which tends to be most the winter. But there's all sorts of creative ways you can wire stuff in.
