A practical guide to catching fulfillment errors before they cost you a customer Picking and packing errors almost never cost what you expect. A wrong item or a mislabeled box seems like a one-off mistake, but it sets off a chain reaction: a return, a re-ship, a support ticket, and often a customer who quietly stops ordering. The good news is that most of these errors come from a small, predictable set of causes, and most of them are fixable.