15 years ago I worked for a major manufacturer of high-end office equipment. One of the "upgrade" hardware features the machine had actually shipped with each machine. When a customer ordered it, the service technician only had to enter a code in a Diagnostic screen to enable the hardware.
I had the task of implementing that feature and at first it seemed like a bit of a scam. After some thought it made perfect sense, though. Because of manufacturing costs, it was far cheaper to build each machine with the extra hardware than have the field tech install it. Besides, probably 90% of customers purchased it anyway.