The binding of the book is part of it's value.

It's an almost 150-old piece of skin. Everyone who interacted with that poor woman is long since dead. Everyone who interacted with someone who interacted with that woman is either dead or in mid-to-late 70s, that's how far this is. I would be surprised if there was a 'family' who waited for this moment, and who would ask anything else than just to cremate the piece of skin.

I'm parisian, and part of my family is in the region for a long time, and yet it's not like I'm mourning every day because potentially some ancestor's tibia is being used as decoration in the catacombe.