[thstone]

This is similar to the situation that I have with my Spec Boxster that has no door windows and no mechanical steering lock.

Electrical protections are mostly useless. With the mechanical portion of the key, they can unlock the doors and unlock the steering allowing them to simply push the car away (and into a waiting trailer to drive off unseen).

Suggestions: block the car in by another car; use a heavy duty cable and lock run though the wheels and chassis to a permanent object; put the car on jack stands and store the wheels in a secure location; wheel clamp, steering wheel lock, etc.