I never actually got the quest/hunted for books/keys or whatever as there was nothing about it in news so only people that got the quest was there was probably friends of Clown's then others heard bwt it.. That being said would love to see more stuff like this just out of the blue popping up with secret room with password to get in or some criptic riddles/clues around map about doing something.
I made it as a secret quest where I announced the first clue here on graalians, unfortunately it didn't go 100% to plan and people who figured the quest out skipped steps when explaining it to other people