Spanich Decryption of Claude Blatier's letter (1582)

One of many interesting pieces described in Desenclos and Clinet (2025) mentioned the other day is the Spanish decryption of a letter of Claude Blatier in Tournai to Henry III (23 October 1582). The arrangement of the decrypted key with borders is very similar to that in the decryption of the Duke of Anjou's cipher I quoted from BNE in "French ciphers during the Reigns of Charles IX and Henry III". Probably Blatier's cipher was also decrypted by the same Spanish codebreaker, Luis de la Cerda.

My article mentions a short ciphertext of a Claude Blatier du Belloy, a French agent in the Low Countries, with what seems to be the plaintext in the margin. I was hoping to establish the mapping between the cipher symbols and the plaintext, but the Spanish key does not seem to match. So this short specimen remains a riddle. (Some letters of S^r Blatier in the Low Countries (1584) in BnF fr.16127 (f.196 ff.) do not include cipher.)