How can I prove to an airline that the iPad mini they found is the one I left on the plane, without giving them the passcode? I left an iPad mini on an Icelandair flight. They just sent me this message:


  "We have an item matching your description. Can you please send us details about the item, preferably passcode, to identify you as the owner."



This is a Wi-Fi only model.
It's almost certainly in Airplane Mode with the Wi-Fi turned off.
It’s at the lock screen.
I'm in the US and the iPad presumably is in Iceland.


I would rather not share my passcode if I can find a way around it. 

What reasonable ways can I respond to prove my ownership of this iPad?
If you have your iPad's serial number it should be visible on the back of the device.

source: Apple

As mentioned in the comments below, you can get the serial number by either:


Logging into the AppleID associated with the device at appleid.apple.com.
In the Apple ID area in the Settings app on your iPhone logged into the same Apple ID. (The very first thing if you scroll to the top of Settings.)