registering a product without a purchase date

I have a razer kraken that I recieved for my birthday this year and I'm trying to register it to my account so I can access Razer Surround (I no longer have the activation code because I used an older version of Surround and didn't bother to keep the key that came with my headset because I didn't think I'd need it), but I can't register my headphones with my account because I don't know the specific day that they were bought. is there a way to register my headphones/access razer surround without an activation key or purchase date?