What UFO videos were called hoaxes but later confirmed to be authentic?

The Nimitz video is one example. It was suspected of being a filmmaking hoax when it appeared online in 2007. According to this writeup of the original discussion, the person who posted it was even banned for hoaxing, years before the Pentagon confirmed it was Navy footage. What other cases are there? By authentic I mean actual footage, not necessarily aliens. Would love links to the original hoax claims and whatever later cleared it up.

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The Nimitz encounter

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