Similar thing happened to me a while back. Ex girlfriend needed to borrow one of my cars. She had already crashed the 180 so I gave her the Altezza to drive. Rules were to never park anywhere but in the garage over night. She parked at a friends on paratai drive and it got stolen. Lucky they only made it about 100m before the steering lock came on. They must have tried for hours to break it as the interior was a mess.
Insurence said if it had been nicked I would not have been paid out. Imagine loosing $21K just like that!
Be a good idea to read your policies a little closer. Good to hear the damage is not too bad afterall.