Jerry, since you don't (didn't) operate under licensing rules in Florida, there would be no problems on that part.
I can see the possibility of setting wheels in motion concerning un-permitted work and the like that may come back to haunt the buyers if it is not cleared up and they purchase the house anyway.
I just don't want to create problems that I have to clean up later or worse that my clients have to clean up. Granted, I told them that x,y and z was wrong and not permitted, etc. but I figure if I inform my client, my job is done and to do more than that may breach their confidence and the ethical confidentiality.