Does the 404media article mention that rare botanical book? I saw an excerpt here elsewhere of their examples and it wasn't in that list.
Also I had a family member work in libraries. They got rid of books for very small prices based on how many people checked them out. Not how easy they were to replace. One example was a 100 year old gold leafed book they sold for £5 to someone who removed every page to sell separately.
> an 18th century botanical text that there's only 2 copies of in existence.
> books that had little in common, except for the fact that they all had ISBNs. This seller also sells rare books that do not have ISBNs, and none of those were part of the bulk purchases
Wow, that's impressive they had ISBNs in the 18th century.