Based on theses facts it seems you still owe the state of Illinois monies. If you want an attorney to check into it for you you will have to hire an Illinois attorney.
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take all of your papers to a lawyer for review.
there should have been a north carolina court order that terminated your obligation to pay support. with that, you would owe nothing assuming you were current at the time. without that, the case is still open.
you need to meet with a lawyer with all your papers to sort this out.