David Chelli found a hitherto undeciphered letter related to the Flight to Varennes and deciphered it. It showed that the cipher between Marie-Antoinette and Axel von Fersen was also used between Fersen and the Marquis of Bouillé. I mentioned this in "Ciphers of Marie-Antoinette and Axel von Fersen".
Moreover, according to Marie-Amélie Brocard's report of this finding, the key word of the cipher was conveyed by indicating a page number of a book agreed in advance, though I could not find its source. I also mentioned this in the above article.
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