I think your best bet is to stop by your local police department during normal business hours, show them the stolen card, and ask for their assistance in activating it so you can use it. There’s usually someone around who’s an expert in these things who would be glad to do what needs to be done.
If you take it to the Police and tell them it is not yours and you stole it, you are in trouble!!! How did you get your hands on a “stolen” gift card in the first place?? How did you know it was stolen?? This sounds mighty strange to me.
Check the Store it is on and ask if anyone has reported a missing card? Otherwise, a found card has no name on it. You just use it or call a number on the back of the card and activate it.
A gift card can only be activated in the store’s systems. So, you either need to manually get onto a register or hack their gift card database and alter the card that way. Inherently the cards have no value. It’s all data in the store’s computer system.
You can duplicate the UPC you can create multiple identical UPC barcodes. When a customer buys a gift card with an identical UPC then the money will be added to any cards with that particular barcode. Typically you can just transfer the money into your bank or you can spend that money before the customer does. This is very difficult to do which is why it’s one of the only ways you can manipulate a gift card. There are other tactics you can use, but none of which are a walk in the park. I definitely think you should try it and commit fraud for Fortnite v bucks.