It is not known whether Audubon himself actually assisted in any of the actual engraving or coloring at all. But he certainly supervised the work. The finished result was about 200 prints for each of 435 copperplate engravings. These double elephant prints are properly termed Audubon originals. It was his project.
Most today are in museums, but some are in private collections.
The first edition octavos were supervised by Audubon, thus they are more valuable on today's market than the subsequent seven editions. Warren's Report on the Birds of Pennsylvannia contains reproductions of the octavos. These are not Audubon originals. Interestingly, Audubon himself viewed only the living birds as true originals, with his art being a mere copy.