I have a couple of stories that I sold to small press magazines that, as far as I know, folded before the stories were published. Well, maybe "sold" isn't quite the right word, because I never got paid for them. And I'm assuming they were never published, because I never got copies, either. I want to start submitting these stories again. Just to cover myself in case they were published without my knowledge, should I mention that in my cover letter, or is that not necessary?