We're checking in all the summer books - over 2,000 of them, on four different purchase orders. That's a lot of books. They need to be checked off on the original order and then the packing slip.
So, one shipment from one PO is 18 boxes. Where, in that 18 boxes, do you think you'd find the packing slip? If you guessed Box 1 or Box 18, you'd be wrong. Box 11. No kidding.