Hey I have a folder of unused steelseries s/n's. I have: 2x Arctis 5, 1x Black Ops 2 Special Edition mouse, 1x Apex m800, 1x Sensei, 3x Sensei Raw and 2x Sensei Wireless. They all include a picture of the serial number on the product. I can sell you the whole folder for €15. Add me on skype if you're interested.