Really awesome.
But i also didn't fount all the notes.
What about an "Noteseeker" ?
As the player finished the game he gets this new item. A small talisman or statue, something like this. It's eyes start glowing if there are still notes in the current room.
I would love to read the full text, but don't want to seek through all the rooms again to find the last 3 notes. That would be too frustrating.