My old boss who had some spooky jobs in the past (NSA, CIA) gave me a copy of a public paper from a researcher at one of those places. I noticed a page was missing from the body of the text. We were supposed to read parts of this paper to understand how to implement something but it felt like my boss was surprised I had noticed, as if he didn’t expect us to read fully. When I asked about the missing page he gave me a knowing smile and said “it’s not available” and contorted his mouth into an exaggerated mouth-clamped-shut position, all the time holding my eye for several seconds and smiling this very final “that’s all folks” look. I think sometime pages just go missing. And we may never know why.