Galaxy S7 found - how can I locate the owner?

We have found an S7 in a field popular with day trippers, but a long way off the path, so it could have been there for some time. It powers up OK, but reaches the password screen with no clue to the owner, who has I suspect, given it up for lost and transferred his account to a new phone. There have been no incoming calls or messages. Any ideas how I could find out who it belongs to?

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