“I’d say a bad drop is, like, five to 6,000 orders on a drop day,” Mr. Ogbenna said, unimpressed. “And then a good drop is anything upward of 10 to 12 to 13,000 orders.” He looked out over the merchandise — approximately 300 different items at any given time, stacked 30 feet in the air. “Now, in my head, this looks small.”