We've ordered a large number of used books for the collection at MPOW, mostly through Amazon and Alibris. I carefully requested non-ex libris (library copies) and books in Very Good or higher condition. Mostly, we've gotten great editions of works our faculty requested.
However, every now and then... I just returned a Very Good copy with "slight wear on the dj [dust jacket]". What wasn't mentioned is the indelible ink on the dust jacket flaps, the red pen comments throughout and the pencil annotations. Very Good? Really???.
Clearly, we have different expectations of that phrase.