We know for sure that at least the radar from E-2C Hawkeye plane in the area that had returned was confiscated by plainclothes officials who landed on the Nimitz via helicopter.
This jumps to some of his comments about the other folks involved in the story: https://youtu.be/f7XJD_54aNk?t=549
Another part of what he says: https://youtu.be/f7XJD_54aNk?t=1868
Say what you will of Corbel, but the entire 2 hours of interview are worth watching, Fravor is about as solid of a person to report this as you can get.
Watch Histoy's Unidentified series.
Time to slink out now for me. I derive some entertainment from the puzzling over what a UFO might be. The ensuing unwarranted speculation into alien origins puts me off. And the people who posit a government conspiracy tend to assume just those origins.