How to contact owner of lost iphone

It asking for an Apple ID is part of Activation Lock. As I said earlier, the only way to contact the original owner is if they leave a message on the device. It appears they did not. Your only option at this point is to recycle the device responsibly. You can contact Apple to recycle the device, or if you have an Apple Store close by, you can bring it in to recycle it there.

Unless the owner left a message on the lock screen of the phone, there really is not a way to do it. You can return it to local police, as the owner may have filed a police report.