I & II: "newly discovered" elements. That were out of date when I picked up on them years back. In my own words: Useless for my pursuits.
III: I have no idea. How should I know? I don't habitually hack everyone and everything that comes my way you know.
IV: Gold - quite useful for its conductivity. Plus, funding my plots does cost a fair bit, you know.
V: Luckily, no. While my systems are fireproof, I've no real interest in fire-starting idiots.
I am a scientist of this world. The most brilliant one, in point of fact. So I know about all of them. If there are elements that haven't been discovered yet, I wouldn't know about it, now would I?
Of course, I would be the first to discover it.