List all the account numbers as listed on your credit report and your last 4 of your social. That and your mailing addy should be plenty for them to find your account.
Just search the forum for each creditor, i.e. USAA GW, read the thread(s), then go from there. You may need to contact one or more of the original posters via PM for creditor contact info. There may also be some backdoor numbers on the sticky sections of each forum.