As far as I know, standard procedure at the end of the production line is fluids, start-up and run-in on rollers before they drive off. I can't imagine "no fluids" unless this gentleman had enough special pull to have the cars pushed off the line to a special transport. Even the common transport trucks of the time drove the cars on and off the ramps.
Not to mention, Tonawanda test ran every engine (with fluid to check for leaks). Imagine what that remaining dampness in the blocks has done by now.....
Verne