Amazon FBA shipment plan setup for mixed SKUs

An FBA shipment plan can look correct in Seller Central and still create warehouse trouble if the mixed-SKU carton setup is sloppy. I learned that after a shipment with three similar variants arrived fine on paper but took extra time to receive because the box contents were not clear enough. The units were not lost, but the delay tied up inventory right before a weekend promo. The first thing I c…