Razer Surround activation code

I have been using surround software with my Razer Kraken headphones for a bit, and I can't find the activation code that came in the box. I already registered all the products I have, and it wouldn't let me register them again to get the code. I'm really mad that I have to buy the code since I didn't get the code when I opened the box. Is there any way to get a code from an already registered product?