It's called an "In camera review". Assuming someone sues Abbott over this, then a judge can take the documents in question, look over them, and make a determination on whether or not Abbott's claims are true.
That ruling can be appealed to higher courts.
Of course, then the public body appeals it and the appellate justices then have to read the 800 pages all over again.
But eventually you should get a half-decent result.
The FBI and friends can also use their means of unlawful surveillance and leak the contents to politically aligned publishers.
My guess is that they discussed a lot of horse trading too candidly.
No. But there are investigative reporters.
The government uses "special masters" or "taint teams" if there's a scenario like this, at times. One was involved in the Trump Mar-a-Lago case.
https://www.americanbar.org/groups/litigation/resources/news...