YouTube lost media

I have Mask Off by Lindsay Ellis. It is not lost media as it is unlisted www.youtube.com/watch?v=C7aWz8q_IM4

I have a few TheGamerFromMars videos, all of them appear to be available on the official channel.

I do not have anything by SevenSuperGirls or MatthewSantoro.

All of my TREY the Explainer videos are still on the channel.  

I do not have any of the original Waxonator videos.  

tydaze: I searched that list of channels.  No matches besides 2 Waxonator videos.  

Peppa Pig Death Surgery, no match.

therockinggoomba: For the entire collection I will have to ship a hard drive.  

I have 11 videos about TotalBiscuit but none of his videos!  Were they long talky videos?

Big Star Secret and Snow White Director's Cut, no recognition.