im thinkin most rejection happen on the tail end of the rollers...they could calibrate them so a marble bigger or smaller would fall in a different area and the operator could flick the footballs and tops etc from the rollers....during packing they could catch out of rounds when they rolled down the packing chute...maybe they had more workers on the rollers but i cant speculate....they would be put on the floor in stalls and packed in drums...ive seen the 55 gal drums from champion and marble king...jabo stores their industrials in them...they also use huge cardboard crates thats attached to pallets for ease of movement with a forklift...and they use big steel boxes....im not thinkin there was much inspection of the product factory level but during packing where most of the out of round and oddballs were culled out....if a tank ran into problems or a machine broke they just trashed lots of em...also storage was a problem and the factories were producin hundreds of thousands of marbles a day so many went to dumps and sold as landfill....those jobber boxes were prob under much more inspection than what went on at any factory...the factories were makin...the jobbers were sellin em out of drums or big boxes...