6:07 PM, Monday March 20th 2023
That is mostly correct, although you wouldn't draw your lines all the way back to the vanishing points. So here's what I mean. As noted in pink, you draw those specific 3 vanishing points first, then draw the box trying to aim each edge so that it aligns towards one of them.
That's how you approach it for the first 10, then for the next 10 you do it without drawing those vanishing points on the page.