Wow. I've heard that IBD can lie dormant in boas for months but this is the first time I've heard of a confirmed case where the snake was outwardly healthy for 11+ years.
Do you know exactly which virus was found in your boa? While arenavirus is the one that causes IBD, nidovirus and ophidian paramyxovirus (aka FERLA virus) cause similar symptoms, and in the past symptomatic snakes were diagnosed with "IBD" before more specific blood tests on live critters became available.
Did you take your snake to SEAVS in Fairfax, VA? If not you might want to reach out to them, I think they do research on certain diseases. University of Florida is another option.
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