Storage cage lock/door – common or Lot owner’s property?

Hi,

I’m in NSW.

My padlock was broken off in a break, enter & steal on my storage cage located in the carpark basement. The door (bolt lever) it was secured to was damaged in the process by the crim. I understand the padlock is my responsibility but isn’t the door on the cage common property? Like the door and lock on our garages?

Thanks for any advice.