Let me suggest an analogy. Suppose a US passenger jet crashes, and someone comes up to the NTSB and alleges that it was the result of terrorists using some new undetectable technology. But the investigators find no evidence to support this, and the witness disappears and can't be found. It's just an unsubstantiated claim, one that would cause a panic or desire for retaliation that might be completely unjustified. In those circumstances, would it be responsible to announce that unproven and inflammatory hypothesis to the general public? Or would it be wiser to wait and say nothing until the investigation turned up something tangible?
That's what I'm talking about. Not covering up a known fact, but choosing not to broadcast an unproven hypothesis that might not be true at all, at least as far as Bacco and her people can discern. You can't even call it a secret; from their perspective, it's merely an allegation.
Exactly. Official records of what? There's no hard evidence. It's pure hearsay.If we are talking about official records here, I don`t think people would doubt the story.
I don`t think people like Picard, Riker and Dax (just to name a few more well known higher ranking Starfleet officers who know the truth) are "someone". If they would choose to go public with this story, proof or not, I am sure a lot of people would believe them. At the very least, a lot of people would ask questions and wonder how much of this story is true.
That is unlikely to happen but nobody knows what might happen in future.
I am no expert in Starfleet or Federation paperwork (well, probably more likely files in some computer system) but I can imagine that captains write mission reports and these get filed somewhere for future reference. That means there would be written records, highly classified, but they would exist.