I left my iPad mini in a seat back pocket on a flight that arrived in the very early hours of Saturday morning, I filed a report a couple of hours later when I arrived home and realized I'd left it behind.
On Sunday ~noon I got email saying they'd found it, with the option to either pick it up, or have it mailed for $16.
So, I'm very pleased that it was found after my carelessness - and thanks to United!

I didn't have my name/number on the iPad, but I did have a fairly distinctive sticker on the case which may have helped.