The anonymous letter writer claims that Commodore Nicholson had it confirmed to him by Abraham Baldwin (delegate from Georgia) that after Hamilton’s plan failed Hamilton left and “returned however on a subsequent day, delivered [his] sentiments in writing, & Came off to New York”
An investigation of Baldwin’s papers might provide some clues as to whether Hamilton did supply a written plan upon his return (July 13 or August 13), and if so what the contents of that plan were.
It would be interesting also to determine the identity of the anonymous letter writer.
Sounds like Hamilton's rejected plan was written down.