Amazon uses the same inventory placing concept we used in the military warehouse I ran in the early 80’s. We would receive a daily printout of the inventory and locations for use when the system was down. If we made issues or gains when the system was down we would back-fit all transactions. Inventory was always fun. We would produce a printout by location and count the stock. A re-count sheet would be created for all locations with differences from the computer stock levels. Once the count and re-count was verified adjustments would be made to the inventory. We did all this with batch processing so accuracy depended on the timing of the last run.
