Wow Don, good question!
I am going to admit that on first read I thought you had it wrong.
After all the Centennial race was in 1967...and I know where many of those fiberglass canoes are and I have in fact paddled one but as this is Wooden Canoe Heritage , your question was rightly about the '66 Chestnut canoes.
To add detail- and correct part of the thread to which Benson linked- when the idea of a cross- Canada Voyageur canoe race to celebrate Canada's 100th Birthday was broached, a couple of competitive canoe racers approached Chestnut to build a 25' cedar canvas boat. Vic Maxwell from Rocky Mountain and John Nikel from Flin Flon and a team tested it and based upon their approval, additional canoes were constructed for the trial races in 1966. Apparently 12 or 13 were constructed.
The trials however proved that the cedar canvas boats were too fragile for the race and so fiberglass boats were ordered. Chestnut wouldn't build them so the actual Centennial boats were constructed by Cadorette in Quebec and shipped to Rocky Mountain House for start of the race to Montreal in May 1967. ( Anyone interested in the story of the Centennial Voyageurs should track down a copy of Doreen Guilloux's book "Paddling Portaging and Pageantry")
So...back to your question Don, no I don't know where THOSE canoes ended up, but please share when you track them down.
Bruce