According to a report from the Business Insider,
(https://www.businessinsider.com/amazon-sets-traps-for-drivers-2018-9), Amazon had planted fake packages to the integrity of its drivers.
Apparently the test involved drivers being sent out with a delivery to make, but at some point an error message is sent to the driver. At this point, a driver has multiple options: report the item and return it, or since the error message now deems the package undeliverable, steal the package.
Without stating if it has a theft problem with its delivery drivers, the retail giant is taking a stance to ensure there is not one.