It is likely that there is competition between intermediaries.
Solution:
1, ask the property or security guards in the community (there are always property and security guards who took up their posts before the community was handed over, even older than the history of the community. . . ), what happened in the community, big and small, I think they know better than anyone.
2. Ask the owner directly, and the owner has the obligation to inform. Just tell the owner the phone you answered and provide the owner's phone number. Yes, you are thinking carefully, otherwise you have an obligation to tell you the past of the house.