I lost the THX audio cable and the activation code for my Kraken Tournament Edition, what can I do now?

My friend who lives in the US had gifted me a Razer Kraken Tournament Edition, it was with the THX spatial audio cable and the booklet with the activation code. I had kept it somewhere in my room and now I could only find the headset without the THX cable and the booklet with the activation code. I had registered the product online and now I can't request the activation code again cuz it says that the product is ineligible. What am I supposed to do now? Also, the THX cable was misplaced too so can I get a replacement on that cable? And Is there any way to make 7.1 surround sound work?