Yes; St.Auban has carried Canaples's letter to the Cardinal already.

I heard from his lips to-day--for I was present at the interview--how the document had been wrested from Malpertuis.

For your sake, so that you might learn all he knew, I sought the fellow out, and having found him in the Rue des Tournelles, I took you thither." In a very fever of excitement I listened.
"To take up the thread of the story where Malpertuis left off, let me tell you that St.Auban sought an audience with Mazarin this morning, and by virtue of a note which he desired an usher to deliver to his Eminence, he was admitted, the first of all the clients that for hours had thronged the ante-room.

As in the instance of the audience to Eugene de Canaples, so upon this occasion did it chance that the Cardinal's fears touching St.Auban's purpose had been roused, for he bade me stand behind the curtains in his cabinet.
"The Marquis spoke bluntly enough, and with rude candour he stated that since Mazarin had failed to bring the Canaples estates into his family by marriage, he came to set before his Eminence a proof so utter of Canaples's treason that it would enable him to snatch the estates by confiscation.

The Cardinal may have been staggered by St.Auban's bluntness, but his avaricious instincts led him to stifle his feelings and bid the Marquis to set this proof before him.