How to know if ipod is refurbished

[LeandrodaFL]

How do you diferenciate a refurbished model from a brand new model? Is there something saying inside the box?

[zodiaque]

the serial number differs from new ones, for example for the ipphone 4 the serial number starts with 5kxxxxxxxxx. not sure whats the refurbished serial number for ipods though.

[Paratel]

I believe the serial will begin with an R wont' it?

[LeandrodaFL]

I believe the serial will begin with an R wont' it?

And where do I see this serial in an ipod nano? And whats the first letter of the original?