yes, but if a supplier repeatedly supplied fewer or more items than were ordered they would not remain as a supplier. If Tesco ordered 1000 loo roles and only 20 turned up they wouldn’t say “ho hum, never mind, we’ll keep ordering from them”. I work in sales. If a client wanted 10 items and I sold them 10 items but only 5 turned up from the suppliers I wouldn’t say “ oh well, only 5 have arrived, a never really knew how many would turn up anyway” and the client wouldn’t say, “oh well, not your fault I’m sure the number you ordered from the supplier was only a suggestion”. I would get shouted at by the client and would, in turn, be shouting at the supplier asking where the things were I’d paid for, and I would never use them again.
in fact none of this would happen because I would never work with a supplier who would add this less than pleasing random element to supply and demand. OC will 100% know exactly how many items they ordered and how many they are expecting. The only way they wouldn’t is if, when they arrive, other parts of the company decide which part gets which cards and which are going to pre-builds, case king etc.