The first thing I tried was shoving ..\..\..\..\data\sound\worlds\tat\ in the front so it becomes ..\..\..\..\data\sound\worlds\tat\effects\crtr_rancor_chew_01.wav. That doesn't work either, presumably because that's not where crtr_rancor_chew_01.wav is actually stored in the game files. And I've thought about what it means some more and realised hold on, when you munge a mod for the first time it creates a template for how the tatooine sound was munged, Sounds\world\tat. (I'd been looking there a lot for reference). That has empty streams and effects folders. Maybe there are some wav files that got munged with all this sound stuff into sound\\tat.lvl. Since I'm munging everything else into my own world's sound lvl, I should be able to throw these files into my own streams and effects folders, change the .stm so it points there instead and munge them with everything else (like you would normally do for custom sound effects).
So now I'm looking for rips of the audio files I need, just so I can munge them into a different sound lvl (and in this case, put them back into Jabba's Palace, don't ask). I've downloaded 'SWBF2 Sound Effects' and 'Stock ambient streams' from this thread by Marth: http://www.gametoast.com/viewtopic.php?f=64&t=28297
It had the 4 console version sounds that were missing (thank you Marth), but I can't find the rest.
tldr: So, long story short, does anyone know where I can find a rip of the following wav files, from sound\\tat.lvl:
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