Looking at all those old photos, and doing some very rounded math, it appears to me that most greens were built with on site materials and would take no more than 300-900 CY per green, depending on size. Tees would be a little less, maybe half. If we average 500 per green and 300 per tee that would be less than 15,000 CY, a pittance by today's standards. That presumes that they didn't move much fw dirt, as the announcers all said. And, there are many cross slopes and partially blind holes to suggest they didn't move much.
One exception to the greens was the Alps on 10, which looks to have at least 5,000 CY of earth in it. I always wondered where they got that dirt. We know they blasted the quarry, and it was not atypical to use large mounds to bury boulders, although typically not under greens. But, they could have conveniently decided that the back mound was a good place to bury quarry rock. Normally, most builders would bury it closer to the source. Another possibility is if there was any known grading for Golf House or Ardmore roads (or other early subdivision roads, but I thought those came later)
As with everything else, we probably wish we knew more.