Case

From BaseballCardPedia.com

Case: The actual shipping container the goes out from the card maker's production facility to the retailer or dealer. Cases used to be a standard twenty boxes, but with the advent of the $100 wax box, manufacturers cut down case size to keep cases affordable. Now as few as four boxes might comprise a case. If you get into buying cases, make sure of the exact composition before ponying up; case sizes have been known to change from one series to another.