Is this the 67 Camaro you are talking about? It was Lot S191 at Mecum Indy in 2010 and sold for $71K. It was advertised there as an original Z/28 with a correct MP block and a 4.10 rear end. I know the tag had the 4L, but I didn't take a picture of it. It was a beautiful car, so it's disappointing that it is not the real deal.
There were 3 67 Chevelles there that were advertised as L78's. I don't believe any of them had any documentation. The Butternut Yellow convertible F241 sold for $62K, the Emerald Turquoise one F264 sold for $58K and the Tuxedo Black one F269 sold for 75K. The Aztec Bronze 66 F261 was also advertised as an L78 and sold for $45K. If any of them are actually real the new owners got a great deal.