Receiving was the longest operation of the day at Fiftify customers' warehouses: a worker went through the pallet by hand, hunted for each item in the list and typed the quantities in. On a large shipment that runs 15-20 minutes, and it is the single biggest source of inventory error: boxes missed, lookalike SKUs mixed up, quantities eyeballed.
A receiving mistake then propagated across every sales channel for weeks. Shopify advertised stock that wasn't physically there, while what did sit in the warehouse never sold at all.