It wasn't an item, so it couldn't be put in an adventurer's bag. Since calling it a B-Quest, Nami then extracted the structural drawing of the dungeon, which would be 25 to 30 years since B-'s last capture, from the structural drawing of the Cozy Guild.
20 to 25 years will be class C+, then 30 years will be class B, 35 years will be class B, 40 years will be class B+, and 50 years will be class A. Extra class for more than 50 years.
"Is this... an ugly picture... and what... is this a letter?"
"Pu... Kuusukusukusu... The image of the dungeon structure can't be understood except for Tara."
Toru explains whether Nami's attitude is acceptable.
"Therefore, it's not something I played with or hid on purpose. And… the usual structure drawing that Karne had… that Nami didn't have? Satra must have said that she sent it to the bereaved family after Karne's death. That's why I too have a structural drawing here..."