If you work in a SCIF, and are dealing with classified information all the time as part of your job a classified document getting accidentally included in a file with unclassified documents wouldnt be hard to do. Or forgetting that you put a classifed document in your notebook and walking out.
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That's the National Security Agency. All 4 buildings, HQ, OPS1, OPs 2B and 2B are a gigantic SCIF. 10's of thousands of people work there every day. Do you think no one accidentally takes a bit of classified information out of there ever? And thats not the entire site. Theres the R&E building and the FANX. Not to mention all the offsite offices that exist not only in the Ft Meade area but in GA, Denver, HI etc. That's one intelligence agency, and not the biggest one. There are 17 agencies that make up the IC, all of them accessing and generating classified information all day everyday. I dont think you actually understand the size and scope of this.
Quick add on.
en.wikipedia.org
"The Washington Post reported in 2010 that there were 1,271 government organizations and 1,931 private companies in 10,000 locations in the United States that were working on
counterterrorism,
homeland security, and intelligence, and that the intelligence community as a whole would include 854,000 people holding
top-secret clearances."
Do you think that number has gone up or down since 2010?