3:47 AM, Monday August 3rd 2020
In this instance, for the 250 Challenge, each box will have their own set of vanishing points. These different vanishing points will be making up the scene. You determine these points by how you construct your first 2 planes. They are not rotated per se, as they all don't share a VP(s), but it is good to make the boxes in a wide variety of Y variations. From what I understand, it is at your discretion how many VPs you use. However, it seems that using 3 point perspective more often is what you should strive for, as it is more difficult to keep track of.
I hope this helps you, good luck!
Best,
Chuddy