answer:Does Redbox take into account that people are going to return DVDs to different places when they assign certain quantities to each box? Yes. Does the number of people renting and returning to different kiosks balance out over time? Sometimes, but not always. Do they have to make a run every few days and readjust the numbers, taking some from A and dropping them back off at B and take that surplus to C and so on? Whether they have to or not depends, but they do stop by every few days and adjust the stock. Even if balance were not an issue, they’d do that at least weekly anyway, to rotate new titles in. The computer in the machine offers its current supply, whatever that is. No doubt the machine also reports whenever its supply changes, so they can track what’s where and redistribute the discs as they want.