Great point. Yeah in terms of the ethical aspect of it, I'm not so worried. If I dispute it and lose, no one loses anything. If I dispute it and win, I gain something and a company that no longer exists loses nothing. But how would I even go about disputing it? It has been years since I paid the thing and I'm not sure what grounds I could dispute it on.
Starting score: TransUnion 660 Equifax 724 Experian 721*[PLUS Score] (All scores dated 7/13/12) 724