DSC-P100. Where's the Serial Number?

I have a Sony Digital Camera that needs repair. It's still under warranty, but they won't take it back with out the serial number. I believe that I sent the serial number in with one of the rebate offers. Now, I don't have one. Is it in the Camera somewhere? If I open it up, where do I look. I've never seen a product without a serial number stamped on it.

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