Earlier quoted context omitted.
I'm actually fairly certain the fictitious entry concept exists in some shape or form. Even name+company@example.com addresses used for email registration are tells of misuse of registration information. Various honeypot traps utilise similar elements. I'm all but certain financial institutions have at least tracking, if not fictitious entry, accounts seeded within various data lists whose use triggers alerts, though…
Huh, now I'm thinking Cliff Stoll did something like this in The Cuckoo's Egg with making up a fake project that intruders then wrote to ask for more information about... or am I misremembering?
https://en.wikipedia.org/wiki/Honeytoken
http://www.symantec.com/connect/articles/honeytokens-other-h...