Chapter 7: Can't Find Creditors from 10 Years Ago

My question involves bankruptcy in the state of: California

I'm going to file for bankruptcy but cant find any of my old creditors, I know now they're with collection agencies. I don't have any account numbers nor contact information. I've tried credit reports but no luck. Any suggestions?

Thanks!

Chapter 7: Can't Find Creditors from 10 Years Ago