I was just figuring out how to get a loss claim started when there was a knock on the door. A kindly Indian gentleman returned my phone and said I'd left it on the bench. I didn't get into the why's and wherefores of it being turned off (the phone warned an unauthorized reset had been attempted) but I'm glad I got it back. I assumed it was a goner.
@SeventhMagpie yes I am pleased I did not have to pay out on a claim.