Yes, but a better way to think about it is that we're rotating these boxes freely in space - meaning, we're dealing with entirely random rotations. As discussed in Lesson 1, vanishing points only go to infinity when the set of lines they govern run perpendicularly to the viewer's angle of sight - meaning that you need a very specific, exact orientation to properly push that vanishing point to "infinity" (which is what is required to shift into 2 or 1 point perspective).

Given that we're dealing with totally arbitrary rotations, the likelihood of achieving such a specific alignment is basically nil, so it's better to always think in terms of there being 3 concrete vanishing points for each box, even if lines converge only very gradually towards some of them.