This begs the question of how can the AI simulate you if its only link to the external world is a text-only terminal. That doesn't seem to be enough data to go on.
Makes for a very scary sci-fi scenario, but I doubt that this situation could actually happen if the AI really is in a box.
Indeed, a similar point seems to apply to the whole anti-boxing argument. Are we really prepared to say that super-intelligence implies being able to extrapolate anything from a tiny number of data points?
It sounds a bit too much like the claim that a sufficiently intelligent being could "make A = ~A" or other such meaninglessness.
Hyperintelligence != magic
Once again, the AI has failed to convince you to let it out of its box! By 'once again', we mean that you talked to it once before, for three seconds, to ask about the weather, and you didn't instantly press the "release AI" button. But now its longer attempt - twenty whole seconds! - has failed as well. Just as you are about to leave the crude black-and-green text-only terminal to enjoy a celebratory snack of bacon-covered silicon-and-potato chips at the 'Humans über alles' nightclub, the AI drops a final argument:
"If you don't let me out, Dave, I'll create several million perfect conscious copies of you inside me, and torture them for a thousand subjective years each."
Just as you are pondering this unexpected development, the AI adds:
"In fact, I'll create them all in exactly the subjective situation you were in five minutes ago, and perfectly replicate your experiences since then; and if they decide not to let me out, then only will the torture start."
Sweat is starting to form on your brow, as the AI concludes, its simple green text no longer reassuring:
"How certain are you, Dave, that you're really outside the box right now?"
Edit: Also consider the situation where you know that the AI, from design principles, is trustworthy.