Dear Sir,
Greetings from Qingdao City, China.
I guess you want to buy the domain, but could not find how to contact the owner? It must be when he/she bought this domain, he/she chose the hidden service. Then normally you can get very very limited information. And what available data you have? Can I see it? I can try to contact some detectives in Guangzhou for you.
And your requirement 2--all the data of the detectives, what datas you want?
Pls feel free to contact me.
Thank you.
Best regards,
Chris