The serial number is not printed on the retail box (usually only UPC/Barcode).
123456789012 or ABCD12345678). Near the AV port / Power port recess.Note: The Console ID (Device ID / ID0 / ID1) (Settings > System > Console Settings > System Info) is different from the Serial Number. Console ID = 12‑char Hex (Keyvault/CPU Key related). Serial = Manufacturing Sticker.