Well, since there are 3, it's rather hard to say which one is missing.
There's one near the cache.
There's one near the boma with the beast power cutscene.
And there's one leading up to the Zakkeg.
Which was only based on an interview with Avellone years later, filled with "maybes" and "if I recall correct", so, yeah, it might not been the original intention at all.
@Butlee;
warp 003ebo
Because it's rather unsure what happens to Bao-Dur. If we just display him it might change the actual interpretation of Obsidian. So instead, he's not shown. Is he on board, is he alive, where is he... it's intentionally kept ambiguous...