Ghost: They rebuilt the Speaker’s private quarters even after the reconstruction. I still can’t believe that he’s gone. He wasn’t the first Speaker, and… he can’t be the last, right? We still need a Speaker. Don’t we?
In regards to your query, the book has indeed been moved from its initial position.
It can now be found near the door for the Speaker’s private quarters, to the right of the arch before you head to the Bazaar, coming from the Courtyard.