How to obtain driver's current proof of insurance?

**EDIT: I do not carry comprehensive on this vehicle. Also, I did find a viable phone number online for a family member so this may be resolved.**

TL;DR: The proof of insurance I was provided is expired and I didn't catch it until I filed the police report online. I need a current copy to file the mini-tort and the person is not responding.

I took a photos of their license plate, damaged areas on both vehicles, proof of insurance, and their phone number.

BUT, I messed up. I completely forgot to get their name, and, I later realized the proof of insurance they showed expired in 2021. And, they are not answering texts to their number.

The name on the expired policy was their grandmother, so I was able to track them down on facebook. I have attempted to make contact there just now, but nothing yet.

I also tried calling the insurance agent listed on the expired copy, but they don't have a record of her or her parent's names as customers; just the grandmother, who has since died.

Anyone have ideas on how to learn who the current insurer of the vehicle is so I can file the mini-tort with them?