I have a friend who sells art auction catalogues. They often contain very fine prints of the works for sale. Sometimes the prints are the first available prints of a particular painting/drawing and therefore considered important.

She showed me a damaged collectors item which, if in new condition would have sold for £100 plus, in it's damaged state it would sell for £20 only. She said that two prints inside (there were over 100 altogether ) would comfortably make £50-£100 each. Like yours the contents were untouched.

ie. at least £100-£200 broken up (probably £500-£600 eventually when all the lesser prints sold) or £20 as a damaged book.

I don't like breaking up books any more than she did but I would have to consider it in her field (you have to know what you are selling). And of course if you don't the person buying it from you might just profit by destroying the item anyway.

I imagine that most of the items that are not extremely collectable would sell very slowly though.