Go ahead and dispute it with no worries!
If you're sure that the date of first delinquency (DOFD) was Sept 02, then the state SOL for collecting ran out last year (since MN SOL is 6 years). They may try to collect on it, but they would not be able to sue you.
It may be reported until Sept 2009 because the
reporting SOL is 7 years.
Look over the way it's reporting very carefully and see if there are any errors. Dispute any errors if possible. Do it via CM. Handwritten if possible (if not, use purple or teal italic font). If there are no errors, then just dispute it my saying you have no knowledge or records of such acct.