Like I said before, I have doubted this diagnoses. The well off babies likely means IBD isn't in the picture, but not enough is known about the disease to say for sure. My babies contacted the disease after birth, and died quickly with only 2 exceptions whom remain in lifelong quarantine with me.
Some possibilities with your litters (assuming the diagnoses was correct, which is the safe assumption on a biohazardous standpoint).
1) Dad has has IBD, mom was lucky and didn't get it, thus babies are clear.
2) Dad has IBD and gave it to mom. Mom has a resistence to it, and is thus a carrier of the disease.
2a)Mom then passes the disease, and her resisitence to her offspring. This means your offspring are carriers and will pass the disease to others, and likely be time bomb's for themselves to die.
2b)Mom did not pass the disease to the babies, thus they are clear.
2c)Mom passes the disease to some of the offspring, while others may or may not get it from siblings if seperated immediately after birth.
Unfortunately all scenerios are possible, and on the basis that the IBD diagnoses is correct. It is the only responsible choice to properly represent your animals to any buyers/adopters. They should ideally be single snake owners, or at least not have any desires for any other boids. In any case a 1 year quarantine period should be followed. I'd suggest following up with buyers for your own sake as well. If after one year, no offspring have shown symptoms or have been diagnosed with IBD, then you have support that the offspring are clear of the disease. This in turn supports that your female(s) are clear, which then supports the male is clear as well. Each level of support is weaker than the first, simply from a statistical point of view.
If, at any time your male passes on, or you choose euthanasia due to his chronic problems, then definately invest all that you can to have a proper diagnoses for IBD. It'll put at ease your mind, and the 20-40 owners of all the babies.
Ian