Notice on this wiki page
http://en.wikipedia.org/wiki/Jean-Fran%C3%A7ois_de_Galaup,_comte_de_La_P%C3%A9rouse
a ship built by the survivors of the expedition.
I came across some long forgotten information that might indicate the area where this ship was wrecked perhaps even the exact spot.
I have passed the info on to the French searchers. You will hear about it if it works out.