Here's one for you. Did you know that at one time tens of thousands of people knew the Treasury's exact days end balance? It seem that the old Mob gambling 'numbers' games, like daily lotteries now, looked for widely published random numbers as the winning number so players would be confident there was not a corrupt drawing. One method, according to Wiki: led to the use of widely published unpredictable numbers, such as the last three numbers in the published daily balance of the United States Treasury,
https://en.wikipedia.org/wiki/Numbers_game