Hi. I bid and won on a 1st/1st Harry Potter Prisoner of Azkaban book which has been autographed by J.K.Rowling. However, there is no accompanying paperwork and there is no hologram. I have since read that not all books signed do have the hologram more over, some holograms are faked so not a definitive way of authenticating. 

Can anyone say with confidence?

Regards,