The below is the entire collection of 1,616 pages of UFO related material, currently archived at the FBI. According to the FBI, this is their entire collection, which they have posted on their “VAULT” website.
It is still being researched whether or not this is 100% of their UFO collection, and requests are still pending. Until that is determined, their “VAULT” collection is archived below, contained in a combined, searchable, .pdf file.
Federal Bureau of Investigation (FBI) Files on UFOs, .ZIP File Collection of SEARCHABLE .pdfs [1,616 Pages, 80.5MB]
Federal Bureau of Investigation (FBI) Files on UFOs [1,616 Pages, 85MB] — Note: Bookmarks within the PDF file show the 16 files that were combined. The raw files (not searchable) are archive below.
Individual File Downloads (Searchable .pdfs)