Most important thing is to find trusted information seller that will not give you fake generated owners info and will tell true that information not found with full refund.
I spent some time to search ways to get owners Information and found people who sell informatioin by IMEI. I was sceptic about this methods because I can't imagine how do they get this information.
Month ago I wrote in Twitter that I'm searching someone who work in Apple to help remove iCloud. Some time passed and I stopped expecting that someone will contact me in this case. On Internet there is a lot of scammers, about 95% of people who selling unlock are bad people.