The serial number will only help identify the iPod as yours if it is recovered.
- If you previously turned on FIndMyiPod on the iPod in Settings>iCloud and wifi is on and connected go to iCloud: Find My iPhone, sign in and go to FIndMyiPhone. If the iPod has been restored it will never show up. You can alos use the FindMyiPhone app on another iOS device
- You can also wipe/erase the iPod and have the iPod play a sound via iCloud.
- If not shown, then you will have to use the old fashioned way, like if you lost a wallet or purse.
- Change the passwords for all accounts used on the iPod and report to police
- There is no way to prevent someone from restoring the iPod (it erases it) using it unless you had iOS 7 on the device. With iOS 7, one has to enter the Apple ID and password to restore the device.
- Apple will do nothing without a court order
Reporting a lost or stolen Apple product
- iOS: How to find the serial number, IMEI, MEID, CDN, and ICCID number