I hope this is the proper place to ask, though probably only indirectly on topic for this community.

What I am looking for is a way or tool to extract from a YouTube playlist the information which of my saved videos (usually very niche music from about a decade ago) are no longer available in it (so that I might procure them elsewhere).

With google being google, and the condensed information of "x videos are no longer available" that is displayed, I am fairly sure the information isnt gone gone, just hidden from the user.

Is there a way to get at that info?

Thanks in advance