You don't actually find that amount of people that you're told at the start. It's just the answer to a question at the end.
Those 9 terminals in the room are not where you find that answer. They actually don't have anything to do with the ending part. There is one in Caves 1 that you have to find. There's a pretty big hint of what you have to do.
And you can't return to answer the questions again. It's just one shot. But the box guy does answer a question for you.
There's also a secret in Caves 3 that you have to get before fighting De Rol Le if you want to fight Falz too.
Let me know if you have any other questions. And another hint: all the answers are in red.
I overestimated how much this quest would be played when I made it, so the secrets are a little much I think.