Assuming that these three points are co-linear and equidistant, we can in fact rotate the box around the line formed by these points:

So the answer is no.
However, one can still represent the box with the same number of coordinates (9):
- 3 for the center point
- 3 for the scaling in each principal direction
- 3 for the rotation of the box
The rotation can be represented by:
- Euler angles: beware of Gimbal lock!
- Implicit axis-angle: a vector with magnitude equal to the clockwise (or anti-clockwise) rotation around an axis parallel / anti-parallel to it.