Need serial number please

If you're looking for the serial number of your specific product, the only two locations that it would be, would be on a sticker tagged somewhere on the machine (usually on the bottom, or on the rear), and on the original box (provided it was purchased new). If the sticker is gone, or the serial number is worn out, and you no longer have the box for the printer itself, then I'm afraid there is no way to conceivably retrieve the serial number for this printer. There may be a chance that there is another sticker, or a tag of some sort inside the printer casing, but I've never taken one apart to look for a serial number before.