How to know owner of a phone?

I got a Oppo F5. My friend found the phone from highway. Dumb owner got his SIMs blocked instead of calling his phone. To find the owner info, I need a way to find who he is. I thought I could break password by installing TWRP through SP Flash Tools. But looks like this mediatek device doesnt works that way. Any what can I do? Debugging is off. I cannot do a reset because that will simply erase any info about owner.

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