If you prefer not to install third-party software, you can use specialized web archives manually.
Various browser extensions are designed to identify unlisted videos by cross-referencing URLs with public databases that catalog unlisted content. 1. Selecting an Extension
Search by keywords, categories, submission dates, or specific uploader channel names.
Below are tools and extensions often used to surface or organize unlisted content: Show YouTube Dislikes and Unlisted Videos (Firefox/Chrome)