tracking down collection accounts by: DebtCollectionAnswers.com
John,
We wish we had an easy answer for you. The best suggestion we can give you is to get your credit reports from AnnualCreditReport.com. We can't guarantee that will be the solution. These debts are bought and sold all the time.
Keep a file of everything (including your credit reports) and do the best you can to try to keep track of everything you can. Make sure to keep excellent records of any payments or settlements you make.