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Hard to tell, but I would suggest checking it out.
While it may have become excluded from your normal credit report, it remains in your file, and under certain circunstances could still be included in a credit report issued under certain circumstances. Credit report exclusion is not absolute.
Additionally, if the collection showed an unpaid status, it means that you still have someone out there asserting that you owe a debt.
It might thus be a required disclosure in a future app for credit. Best to clear it up.
If you dont have the name of the party to contact, you can get that ifor by sending a request to the CRA under FCRA 609(a), for a fee of $11.00.