With regard to that, Gourgaud seems to have repeated the story a bit too often: in his journal of 9th March 1817 he records a conversation with Napoleon on the subject - he seems to have been offended at something in Warden's Letters -
Gourgaud: "I did not write on my sabre that I had saved your life however, I killed a houzard who was dashing at your Majesty!
The Emperor: "I don't remember that.
Gourgaud : What, Your Majesty does not remember! The staff witnessed it and the same evening M. Fain came to ask me if it was with the small pistols I carried habitually in my pockets or with the saddle-pistols. All Paris was talking about it.
The Emperor : "They should have spoken to me."
I'm sure Gourgaud would have been happy with the pictures though.