I was recently bored and watched, after years of avoiding it, The Traitor (2008), with Don Cheadle as a terrorist ... or not so-terrorist. The movie was pretty bad (there's the real spoiler!).

In that movie, which I just check the date for, seems like one of the first pop references to the idea of sharing email drafts in a free email account without sending anything.

https://www.washingtonpost.com/news/worldviews/wp/2012/11/12...

Now, can someone prove me one better and find where this idea got traction? I honestly laughed watching that movie, wondering if Petraeus watched it years earlier, and thought to himself, I wonder if this will work in real life ...

UPDATE: I could, gee, also try RTFWPA! It refers 2005 reports of AQ using the same tactic, you know, where probably he got it from.

Or he got it from the movie, which would make me in a die a fit of laughter!