Jean Regnault

Biography

The police commissioner who was called over the incident of the key.

"Ordonnances et sentences de police du Châtelet de Paris: 1668-1787" (as seen at Google books) contains this snippet:

31. — 1699, 18 décembre, Sentence de police sur rapport de Jean Regnault, commissaire ancien préposé pour la police au quartier du Louvre, Saint-Honoré et Saint-Roch, interdisant la practique du jeu appelé « Pair ou non » et des autres jeux d'argent dans les boutiques at maisons des distillateurs, sous peine de 1000 L.

which Google translates as

31. - 1699, December 18, Sentence police report on John Regnault, former commissioner for the police officer's quarters Louvre Saint-Honoré and Saint-Roch, prohibiting the Practice of the game called "Even or odd" (lierally, "Fair or not") and other games of money in the shops at home distillers, under penalty of 1000 L.