SAN FRANCISCO—The company started adding technology to a handful of warehouses in recent years, which scans goods coming down a conveyor belt and envelopes them seconds later in boxes custom-built for each item, two people who worked on the project told Reuters.
A worker assembles a box for delivery at the Amazon fulfillment center in Baltimore, Md., on April 30, 2019. Clodagh Kilcoyne/Reuters
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