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Nothing to worry about. 30 days past the due date would be when it was reported as a late payment. Late but not super later late may impact your ability to get a credit line increase on this card you never use in the short term, but it's not going to affect your credit scores.
It's possible that your tiny balance could have become subject to a tiny amount of interest. You'll want to make sure you check your next statement just in case "trailing interest" has been charged.
If you never use the card, how was it that there was a balance on it?