A system administrator would have passwords and access to JR files. They would potentially have accessed the payroll files to find bonus amount. They may have read JR emails and maybe one of the emails referred jokingly to his “Good Southern common sense”. If RN written by intruder it is someone that is emotionally immature and movie addict. I find many of these Computer types ( especially 20 plus years ago ) are emotionally immature and due to lack of a social life watch lots of movies and live in fantasy worlds. I’m a computer programmer and think of the people I went to school with or work with, many fit the profile, especially back in the 1990s when Computer work was not as mainstream as today. I would look at the system admins that had access to JR files. I once work for a firm where a system admin was caught reading the emails of the executives so it would not surprise me.