Before you can use the Cartridge by Mail service to exchange your empty cartridge for a replacement you must first activate your mailing box SKU number. The SKU number can be found on a sticker on the box, and begins with CBM.
Track Your Mailing Box:
Once you have printed your free shipping and postage label you can track the exchange of your empty cartridge. All you need are your mailing box SKU number and email address.