I lost my iPhone and know the address of the person that picked it up! How can i reach out to them?

Okay, so I lost my iPhone 5s last week and Find My iPhone was turned on. However, I wasn't able to track it before the person that found it turned it off. When they came home, they turned the phone on for approximately 1 minute (during which I was able to get the address of the person). The only problem is that it is in a building. I Really need my phone back, however I'm not sure how to approach the finder of my phone. I'm not sure where it is now because it is turned off, but I iCloud locked it and there's a passcode. Should I write a letter to them saying I'm offering a reward?

Inform the police.

On the app it allows you to display a message on the screen. But if you do that they will get paranoid and trash it so go to the police

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