Is it just I or some of the sound dialogs are missing? I was comparing it to another version and at the oil rig some people say something like "You don't belong here!" or when you climb the ladder after you exit your boat JC says "Be careful!".
Same goes for the underwater pass, JC doesn't say to you in the elevator that the radio signal is getting lost, rather it will be in dialog texts with different words. Anyone else?

There are also some sound dialogs that exist but they don't trigger when you do some certain action (Like when you collect the last piece of the energy weapon, JC says something like it looks like some energy weapon and its time to make some sintek toasts, or when you try to use the phone JC will say that you gonna need a quarter).

I'm watching some youtube videos, and when you lose your gun you "I lost my gun or similar". It never happened in my game. So perhaps there are some sound clips missing.

Yes, I unpacked the data files, and this sound is there but it doesn't trigger in-game.