Found Media That Was Never Lost

I'd say clockman because if I remember correctly the short was never lost, it was just listed under a different name. 

Honestly, almost all lost media falls under this which makes the distinction quite useless.

I guess so. 

One Example (that I think of) is the Demon Lady commercial (take the snack mix)

The commercial was not lost, it was in one of those YouTube commercials that was uploaded somewhere in the 2010's

And the Lost Media community thought it didn't exist

I guess it really depends.

Recently, I came across what may be the "Now They Hear It All the Time" tinnitus PSA by way of an obscure vhs channel. There were a few comments asking if this was the ad that people were looking for iirc, and although said Redditors haven't replied or chimed in that I know of, we may never know for sure but it likely could be.