I would have cared if it was my phone. I don't understand how you can classify this is anything BUT a stolen phone. If I leave my phone at a bar and some guy runs off with it, it's stolen.

I once left my wallet on top of a gas pump while filling up my car. I drove away, realized my mistake, and was back within a couple of minutes. My wallet was predictably gone. Is that 'finders keepers'? Nope, it's a stolen wallet.

Same thing.