i know i may sound stupid i couldn't find an answer anywhere. :"|
But you could sell them, for example on eBay.
There is also a site, where buyers can order items and you can order that on amazon.com for then with your amazon card and give in their address and you get btc or money, but don't know, if it is legal. . And no, you don't sound stupid. I was also wondering, why we can't simply use amazon.com cards at all amazon shops.