What if he'd dropped it on the street instead? Should you leave it on the street, to get rained on, run over, stolen, etc., or take the phone and attempt to return it to the original owner? Finding the phone disabled, what do you do next? Throw it out? Return it to the street? Turn it in to the police? Presumably you've figured out it's some sort of prototype that is property of a corporation, so you contact them about it. No reply? I could see myself doing the same thing as the original finder, if all pieces of his story are to be believed.