Date & Time: January 27, 2022
Frequency: once
World name: Leviathan
Character name: Rose Lilak
Retainer name: Sostra
NPC name: Scrip Exchange
Area and coordinates: Radz-at-Han X: 11.7 Y: 9.4

Steps:
1. have Master Culinarian IX book in retainer's inventory because I'm not high enough level to use it
2. go to Scrip exchange npc and accidentally buy another Master Culinarian IX book
3. cannot discard or sell the extra book so now I am stuck with a useless book taking up an inventory slot