I find it rather hard to believe that the car would have been delivered w/o fluids. From a legal point of view there is no way GM would have sold the cars w/o things like...brake fluid, rear diff oil, trans oil, engine oil: anything that could have led to this car rolling off the delivery truck and not stopping until it crashed into a bus full of nuns, orphans and lawyers.
Unless they sold it "as is" with no MSO/title and only a bill of sale. Even back in the 60's there were still lawyers out there lurking in the darkness