Toner cartridge serial numbers are 12 digit numbers and start with the letters CA. The (S) on the label identifies the serial number, the (P) printed on the label signifies the part number. Only serial numbers can be authenticated. The serial number can be found on the outer box and on the toner cartridge.
The ink cartridge serial number to be entered is a 7 or 10 digit number. Serial numbers can be found on the outer box, foil bag and ink tank.