a0494a2a_ng__404_Not_Found_Error__Files__Category
[Comments and examples] Search engines may have indexed URLs which have been moved or no longer exist, or these may be referenced in indexes, user's bookmarks, on other websites and in office documents. These would also include user-generated content such as profiles, images etc that has subsequently been deleted. Temporary URLs created by the application (e.g. for time-limited report generation) and URLs provided to third parties that have expired also need to be considered. [Category] 
Old URLs
Benign Unexpected URLs - Part 1 - Missing (404 Not Found Error) Files