If the debt doesn't show on your credit reports, then it has gone beyond the 7-year reporting limit and its most definitely old and most likely beyond the SOL.
Take to court whatever paperwork and records you can pull together that will give the court an accurate picture of your financial status, debts and all. It would be best to organize everything so that you can easily answer any and all questions asked, judges don't like to be kept waiting while you dig through a pile of papers. I'd make a spreadsheet of your assets, liabilities and income and have several copies so that the judge and attorneys can have a copy if asked. Make sure you have receipts, bills, statements, invoices, etc. to back up what's on the spreadsheet. You probably want to take copies of your bank statements too.
You can get copies of your credit report from Experian, Equifax, and TransUnion at each of their websites.
www.experian.com
www.transunion.com
www.equifax.com
It costs about $9 for each one. Stay away from 'consoldidated' reports as they may not have complete information on them.
You may have some negotiation room in court. Its my understanding that a payment plan is ofter offered, sometimes for less than the full amount, in lieu of garnishment or siezures.
Depends on the attorneys and the judge I guess. The best thing you can do for yourself in court is to be honest and organized.