The problem with IBD is it can remain in a carrier state for an unknown amount of time. This is especially true with boas. A boa constrictor may be able to shed the virus it's whole life without itself coming up with any symptoms. It is hypothesized based on observations that pythons will show symptoms and die sooner than boas. If the reptile show was several months ago then and your pythons contracted the disease they would be "most likely" showing symptoms, and or be dead by now.
Remember that with this disease there is little known facts; all related to the still questionable etiology. All that is available now are best guess answers.
If you have problems with regurgitation that arn't obviously related to large prey size or cool temperatures; if your snakes look as to be "poor doers", if they have concurrent illnesses like upper respiratory disease, if they have an unexplained weight loss, if they begin to "star-gaze" or exhibit other neurological symptoms, then you will have to question more seriously if you have IBD in your boid collection.
For the time being, I would keep a closed collection of boids for one year. Withen the collection quarantine is not necessary, and actually discouraged. If you have IBD in your collection, unfortunately your pythons will act as the canary and signal the alarm bell when they soon begin to show symptoms.
Unfortunately there is no anti-mortem test that rules out IBD. Actually, you can never say an animal doesn't have IBD with 100% certainty. Detection relies on finding inclusion bodies. There is always a chance that the pathologist just didn't have the right tissue sample.
If you have deep pockets, and a willing, expert herp vet (are you in Florida? Dr. Jacobson is the IBD guru) then a surgical biopsy of the pancreas and liver may help you rule out IBD. These are the most likely tissues to contain inclusions that are available in the living animal. By all means if you have an animal die, get it necropsied specifically looking for IBD, it's worth the money!
Good luck 
Ian