I was opening 100 medium clues today and in the process I received several new master scroll books. They, along with all other chest loot went into a new loot tab. I had a largely filled master scroll book in another tab. At the end of the opening I took my 3 presumably empty master scroll books from the new loot tab to watson and turned them all in for scrolls. Head back to the bank and on my main tab what do I see but a missing Master Scroll Book where my previous one had been.

According to the wiki "Empty master scroll books can now be exchanged with Watson to receive 10-20 teleport scrolls to his house." It says nothing about trading in filled books. So what happened here?

Either selecting the empty books in loot tab also pulled out my filled book and I failed to notice, and Watson took the trade, or at some point in the opening and doing of master clues I managed to drop or lose my main book without dying. I'm an iron so this is especially shit as I can't just buy more scrolls to refill my book. Completely demotivated me for the time being to lose hundreds of clues worth of teleports to some unclear game mechanic.