I have followed this thread from the start and my comment would be.
If it was an honest mistake by the guys working in dispatch which could of happened. I cant see or understand how Mack Chaser had the serial number for the Motor that came off Rosco's Cat sent to him as the new motor in question. I think if it was a dispatch mix up Mack Chaser would of gotten the paperwork and serial number from the motor that was sent up north.
Just my thoughts.
Cheers Brett