11/12/17: While the room was a mess when Rivala was in there, Rivala wouldn't really notice the importance of them. Lethe was starting to chart things out back in chapter 8 (the note taking started earlier, of course). I know the room details haven't been consistent since then... just pretend it's been magically remodeled or something.
I did rush this a little, so apologies for the mess. I need to switch out my pens more often. I've forgotten just how sharp a .005 pen is supposed to be (before the tip gets squished down from wear).