Is the property responsible for the theft of uninhabited houses?

Generally speaking, theft is a criminal case and does not belong to the service scope of property management companies. But it depends on how your property management contract stipulates. You said you haven't checked in yet. I estimate that you have checked in and taken over the building. Personal belongings are kept by individuals, so the property management company is irresponsible. Even if you go to court, I will lose, but now you say the door mirror is not installed. If you have been away, the property management company can't install it for you.