Unfortunately, a resting key only addresses the problem in certain circumstances, but it is a significant improvement over the Mk2 keyless system. In some instances, the signal has been captured as the proprietor exits the vehicle, such as in a parking lot. When the owner is out of site, adjacent thieves intercept the signal that the car is being sealed and steal it. Despite the fact that cameras are present in many parking lots and there are more individuals nearby, car thefts continue to occur.
Obviously, by the time the signal is captured, the key would not have gone to slumber. Even a faraday bag is ineffective because the signal is required to secure the car, so the key cannot be placed in the bag until after securing, which is too late.
Thefts may be deterred by a high-quality visual anti-theft device, such as a steering wheel lock, or an alternative such as Autowatch Ghost II. Even though the new slumber key does not completely prevent duplication, it is a significant enhancement over what was previously available.