Whats a piece of lost media that will never get found

I've did two analysis videos last year, one debunking the claim that both hijacking videos used the same footage when in reality it's entirely different content, and another analyzing the existence of the full tape and the fact that it will never likely be found, as the culprits themselves were never identified or even found for that matter.

Here's my two videos in question:
youtu.be/aa-VQnr2Vj4
youtu.be/re50q2nW3ho

If the information from my two videos related to the Max Headroom incident is officially correct to you guys, it's likely that the only copy of the Max Headroom hijacking master tape is presumably lost beyond the partial prints sourced from VHS tapes that have been floating around the internet for years.

They're definitely weren't recordings of Lincoln giving the Gettysburg Address, it would've been mentioned if any kind of recording equipment were used at the speech. He could've recorded it later (Churchill only recorded many of his famous wartime speeches after the war) but since this was before Edison's phonograph it almost certainly didn't happen. There were rumors he used the phonautograph system of Edouard-Leon Scott de Martinville, which has been reverse engineered to produce crude audio of speech from the 1860s, but there is absolutely no reason to believe this happened. www.firstsounds.org/features/lincoln.php

That being said, there are people who were known to have made recordings which will likely never be found. Mark Twain, Rutherford Hayes, and a man born in 1790 made recordings which have never turned up. 

I think it's safe to say the test pilot for Jimmy Two-Shoes will never be found. It sucks because it sounds interesting as hell(no pun intended)

A bunch of fanfics on Fanfiction.net that I fondly remember reading as a kid will probably never be found(Spongebob Duelpants 1 and 2 were two of my faves, the author of them said he longer has copies of them and they weren't archived).

and several Xbox Live and PSN games that got delisted years ago like Earthworm Jim HD.

Didn't know that interesting, i'm not holding on the Lost Levels of Garfield Caught in the Act being found though.