All iPods have their serial numbers on the device. They can also be found:
- In the Settings app > General > About > Under Serial Number
- The label on the outside of the iPod box
- Original Purchase Receipt
- Apple Store Repair Receipt or AASP Repair Receipt
- In iTunes/Finder when connected to a powered-on device
iPod Shuffle
The serial number is on the inside of the clip at the back of the device.
iPod Nano
The serial number is on the back of the device, near the regulatory markings.