My mom-in-law lost her iPhone 6 december of 2014. Then around 2 weeks ago, some pictures were appearing in her iPhone 5s's photo album. It was found out that the pictures were automatically saved from viber.

Apparently, the one who got my MIL's iphone uses viber which still uses my MIL's mobile number. My MIL's iphone 5s, which was restored from her iphone 6 after she lost it, is now a participant in a group chat in viber.

How can we pinpoint which of the participants in the group chat got my MIL's iphone 6?

From the pictures, we were able to pinpoint the work location of the one who got the iphone 6.

Also, should we be able to identify who is holding the iphone 6 now, how can we take back the phone? Baka kasi nabili lang din nya, not knowing na nakaw lang pala yung phone.