it's definitely Bob kirkland because he's the one who broke into jane's place to get pictures of the scheme jane mad to find who is RJ. there is no way RJ could know the list jane made except if he had all the clues jane had. besides Bob told Lisbon once that he had a circus life and that he considered himself an american for travelling everywhere with his family. and that is a leek to find out how he could know about jane's happy memory back then.