It often happens the original key of a cipher I reconstructed from deciphered letters is found in some other place in the archives. For example, after reconstructing a cipher from BnF fr.15578 for my article "French Ciphers during the Reign of Henry IV of France", I found the original key in BnF fr.7131.
Now, I found the original keys for "Savary de Breves' Cipher (1602-1603)" and "Beaumont-Fresne Cipher" reconstructed therein in BnF fr.3462.
By the way, the Beaumont-Fresne Cipher is interesting (albeit inconvenient for use) in having an extensive syllable representation by arbitrary symbols rather than Arabic figures.
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