Let me preface by saying I fully realize this isn't fully safe in that you've now made it possible for someone to have a key to your car and drive off with it. That said: If you lend someone your car with a keycard, would the following work to get your card (and your keycard) back? They drive somewhere and park the car, put the keycard inside the glovebox (or some other hidden place). I lock the car remotely using my phone app At some later time, I show up, unlock the car using my phone and drive off Would this work? Beyond the risk of someone breaking into the car and finding the keycard and thus being able to drive off, since the keycard requires proximity to activate, it's presence in the car shouldn't prevent remote locking or things of that sort, right? This is the equivalent of locking one set of keys in the car and arriving with another set to pick it up?