"Un-Deleting Valve's Unreleased Content" Anything interesting found yet?

[Bruner]

Sorry if this isn't the correct forum to be posting this. I don't really know where it'd be appropriate.

Here's Tyler McVicker's video for context:

Anywhoo, I've heard that this method of recovering old content not only works in Source 2, but a select few Source games as well. Is there anything of interest that has been recovered? Or, anything at all?
Please document it here, no matter how insignificant that asset may be. I'd love to hear more about this.

I'm eager to know if this works at all with the 2003 leak build of Half-Life 2, or at least retail Half-Life 2.

[BlahBlahBlahMisterFreeman]

(hl2 beta related wise)As far as i am aware most content is probably in the .gcf file type or in folders, probably making it impossible unless that dev makes a .gcf version, or something like that.

[Bruner]

It turns out this doesn't work for the 2003 leak of Half-Life 2, or any of Valve's games before Left 4 Dead.
Pretty unfortunate, but at least it works for a select few games. Again, if there's any interesting discoveries,
i'd appreciate you post them here.