Although not on Amazon, but rather on Microsoft, heres an example thats come out fresh from the oven (although commited over a year ago) that lets us see a potential and probable origin of these gift cards on the market: an inside job.
A former Microsoft employee is being accused by federal prosecutors of stealing gift cards and large sums of digital currency from the company and then reselling the items online to fund real-life purchases, including a $1.6 million lakefront home and $160,000 Tesla vehicle. <
>
See
https://www.foxnews.com/tech/microsoft-employee-accused-of-scheme