I'll definitely discuss this very soon. Basically though, Snowden and his slapdash searching is utterly irrelevant though.
1., He definitely wouldn't have had access to the specific records of the USAF and the NORAD that contain hard UFO data. Not so much because of security clearance or the like (in fact a lot of UFO data is classified no higher than SECRET, and I have doctrine that lays that out, as well as letters to researchers from NORAD HQ OI in the 1990s) but simply because the areas of USAF and NORAD Im talking about are internal military systems related to fight safety, pilot interdiction of unknown aircraft, meteorological information, quarterly reports on unsolved scramble-to-object events, even raw radar data in the form of track surges and altitude averaging and all sorts of stuff. Nothing to do with where he looked. He would have stayed on home turf: CIA, NSA and some information warfare areas of USAF and Army.
2. Where he looked has (historically) never contained anything important on UFOs that leads us to believe there is acres more of it; ie he very likely sorted haphazardly through CIA current policy type correspondence files, National Target Priority Action rationale records, basic embassy-to-CIA traffic, or say NSA Staff Studies that get used as NSA input into wider assessments for the Director of Central Intelligence, and so on.
3. Its not unreasonable to assume he didn't actually have infinite time to do any of this. Imagine the terabytes of digital holdings, and the indexes of hard copy records, he would need to painstakingly reveiw, even from just simple and incomplete keyword searches. He'd have to know all the terminology and phraseology for one, and how its changed over time. And all this assumes he was unequivocally getting full access to vast databases, their backups, unpublished records and drafts, etc even in the non-UFOlogical computer systems he was quickly looking at.
The main thing though is Point 1. If he didnt have access to certain in-house air defence records, statistical tabulations, sector directors logs, airborne intercept mission reports, event messages, etc held by a bunch of areas within the USAF and NORAD, then he surely had nothing to go on.
For all we know he did one or two unsuccessful keyword searches in an inappropriate system and then simply walked away.