Originally Posted by FullTime4

I have not done this on my T4R Limited yet because I want to purchase an additional smart key instead of using my spare, but my plan is to wrap the smart key in foil and hide it inside car. Then hide the metal key on the exterior of vehicle.

I think this will work... In the event of a lost key you'll have to get the metal key from the exterior to unlock the driver's door, then retrieve the smart key to start the vehicle (if the battery is dead, hold it against the start button). I like this approach better than hiding the entire smart key on the exterior because it adds another step to actually steal the vehicle vs. just finding the spare key.