On the machines I'm in charge of I keep a spare key but you need tools to get it from where it's hidden. Make your keys hard to find by hand/ tipping stuff out of turning over stuff. If it can't be found without removing/ dismantling something to get to it chances are It won't be found . It may take you a couple of minutes to get your keys but be almost impossible for someone else. A spare key with someone else is a great idea but it shouldn't be able to be easily traced back to you. At the end of the day giving one to someone else is giving them potential access. Americans have safety deposit boxes but I'm not sure if we have the same sort of thing here
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