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Using a twist tie to secure a key on your car is a very very easy thing to do. I suggested behind the grill because there are many hoses and wires just under/behind the bumper of the car. I have also used the springs behind the tires, although you do get dirty trying to retrieve it from there in bad weather if you're not careful. There are many places on the car that you can find to twist tie a key so that it is not immediately visible to people around the car. You just got to remember where you put it. CRS disease aside. CRS = Can't Remember Stuff Hope this helps!