In the 70's a friend had an old fire engine as a Scout mini bus. There was some irrepairable fault in the ignition which meant you could start in with pretty much any key. He got round it by wiring in an old-style DIN connector and connecting it across two random terminals and making a matching "key" with the other part of the connector with its corresponding terminals.
When you plugged the "key" into the socket the circuit was complete. Mounted in the dash the connector had no obvious association with starting the bus and replacement "keys" were readily knocked up for the pool of drivers as required. Of course it wouldn't have taken a lot of skill to get around this but you'd need to cotton on to what you were faced with and work out how to bypass it. No opportunist would bother.
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