Many creators post "unlisted" videos on their blogs, Patreon, or social media. You can use link extraction tools to find them.
agervold/youtube-relist: A Chrome extension for displaying ... - GitHub youtube-relist. Lists youtube videos that are unlisted. see unlisted videos youtube extension
Because unlisted videos are "hidden in plain sight," they are often used for: Many creators post "unlisted" videos on their blogs,
Unlisted videos do not appear in search results, on channel pages, or in recommendations. You cannot find them without a direct link. But what if you suspect a creator has unlisted past content? What if you lost a link to a tutorial that was later hidden? This is where the concept of a comes into play. on channel pages