I found a Verizon iPhone 4 but I can't figure out who it belongs to?

When I turned it on it goes into setup mode. So I have to assume that someone reset it because it does have a apple Id but I don't know what it is. How can I find out who it belongs to so I can give it back to them? I legitimately want to give it back. I'm part of team #RAK #KCCO. So don't be a dick and say something smart. Please.

Take it to an authorized dealer. If they can't help, keep the phone, get it switched over into your name, and thank the gods above for lookin' out!

No way to find out just keep it or something