Amazon.com Inc. is rolling out machines to automate a job held by thousands of its workers: boxing up customer orders.

The company started adding technology to a handful of warehouses in recent years that scans goods coming down a conveyor belt and envelops them seconds later in boxes custom-built for each item, two people who worked on the project told Reuters.

Amazon has considered installing two machines at dozens more warehouses, removing at least 24 roles at each one, these people said. These facilities typically employ more than 2,000 people.