Razer 7.1 activation code

Hello, i find my old razer kraken chroma 7.1 headphones, i registered it to new razer account (old acc just forget... :/ ) for years lost everyhing from package to purchase receipt (just some one throw away all packages with receipts inside like trash :/ ) how i can get that activation code? To activate 7.1 suround sound? And i had same problem with another razer ManO'war headphones :/ Thank you.