The inside of the Ariane fairing looks unlike the section of supposed fairing that washed ashore. The Ariane fairings for the Herschel-Planck launch had a lattice on the inside. See launch video here:
ESA Portal - ESA en route to the origins of the Universe - images
Without knowing the launch azimuth and the time for jettisoning the fairings, hard to say whether these could readily have washed back to Guyana.
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In other news, 43 of the 50 bodies have been identified, including the Captain and three other members of the crew. (Not sure why the body count has dropped from 51 to 50.) Autopsies reveal none of the bodies recovered had drowned, so no repeat of the post mortem findings for several of the Air India passengers.
About 1100 pieces of the plane and contents retrieved; over half of which are already in France (including the VS). Remainder to arrive in France early August.
Sonar search to start soon, and last about one month. The French seem to be pessimistic that they will ever recover the black boxes.