hi there i rescently required a pair of razer kraken 7.1 v2 headphones off my brother and i would like to activate them iv asked him if he still got the box and paperwork for them but no joy he said he got them roughly 4 years ago thats it!! so is there anyway of activating these , the serial number is S/N: HN1709D04706797 RZ04-0206
thank you will look forward to your response