They’d already been very[1] publicly[2] caught out on housing likely forgeries. That Nova documentary says (I believe verbatim) that some of the fragments they bought were “too good to be true”, one particular example I recall was a few lines that are often quoted together but quite far apart with significant context in between, that somehow ended up on the same fragment. Overall the documentary makes a compelling case that the forgers started small but evolved into targeting groups who were unreasonably gullible. Given the Museum of the Bible’s history of being unscrupulous historians I think they have it coming rather than being victims.

[1]2019 November https://www.pbs.org/wgbh/nova/video/dead-sea-scroll-detectiv...

[2]2018 October https://www.livescience.com/63895-dead-sea-scroll-fakes.html