So a couple things to clear up. First, it is not JUST giftcards. That was simply the one example stated in the article. They discuss there are multiple actions. Second, it's not a former employee going after them. She states she contacted the SEC in August, a month before she was fired (believe what you will on that, I don't have the documents, etc.).
Again, I'm on record here as saying I'd be floored if this was true, but this is not something she brought AFTER being fired, nor something on JUST giftcards.