Once the black plan with all sorts of plans for escorting ships and protecting them from submarines and all sorts of very top secret stuff. No copies were held by the brain storming committee. One copy was given to Daniels and he gave that copy to the Chief of Navel affairs to start issuing orders. Then sometime later the plan was discovered missing. At first some were speculating on German spies. Then they gave that idea up but were lost on where it could be. At the time of the story in 1921 it was still lost.
Daniels ended his story with his speculation.
https://chroniclingamerica.loc.gov/lccn ... d-1/seq-3/