they didn't lose it. they put it in a recycling bin
They probably stuck findmyiphone on them so later they can track you down and sue you for stealing their phone.
how interesting. are you going to unlock it so you can use it? if so, go to the nearest hole and live in it until you die by fire. if not, go to the nearest hole and live in it until you die peacefully of old age. you could even build a nice cottage. User was banned for this post