For over 10 years I have had several companies that I had 401k's with and I'm trying to obtain information on how, I can find out what companies they were with.

The plan administrators would have been mailing you quarterly statements to your last known address. In fact they are legally required to. Did you not bother to change your address with them if you moved?

Or you can check back with the companies to see what the status of the accounts are.