“Every linked file with a forward or backward slash won’t get collected and will even crash InDesign. I know… I know… you never use slashes in a file-name, right? Well, neither do I. But that actually makes it even more dangerous, because it’s not something I’m thinking about when I’m creating artwork and I always receive a lot of files from third parties.” Source
The point is: you can better check documents with a stand-alone tool, such as FlightCheck software by Markzware for preflighting documents for print quality control during prepress. The advantage is that, as a stand-alone preflight solution, FlightCheck can check images and native files, without the need to open InDesign, Illustrator, Photoshop, etc.
Here is a movie on using FlightCheck for preflighting files in prepress:
Preflight Checking a batch of Images with FlightCheck
Preflight then Quality Check