my iphone was stolen want to find a serial number

Hello,

My IPhone was stolen. I see the last location (very strange as on the other phone it shows different from the location was the last on the laptop - on the laptop, it's later and the place where the person turned the iphone off).

I want to leave information to the police, but can not find the serial number.

How may I do it?

Thank you!

Rina