As you noted, the documents represented by the pink icon have no pages. It's not that the server can't find the image pages (as could happen if e.g. a volume is removed), it's that the database thinks that there are no pages assigned to this document. Without knowing more, it's hard to say if the page was never added to the document, if it was added and later deleted, or added and later moved to another document. Does your repository have any auditing enabled? If so, you could see all the actions taken on the entry in question. Without that (which is a separate module) you're kind of limited. You might be able to deduce something from the creation date, last modified date, and last modified by properties of the documents in the folder. In those fields, are there noticeable differences between the documents with and without pages?