Are any of the services that purport to search for your personal info on identity theft darknets and databases accurate and trustworthy?

Some important documents with my private info was stolen and I fear it might have been sold to identity brokers. Do you guys have any experience with any of the services that say they will check identity theft sites or trading networks for your private info? Can they themselves be trusted?

If you know one that specializes in checking for immigration/passport stuff, that would be great because that's what I'm concerned about.

databases identity identity theft personal privacy search services theft