Wall of boxes question

On Canada’s Worst Driver, Season 2, there are numerous walls of boxes. I’m just wondering what precise scale (or dimensions) would be for one box.

Reference image:
. If precise dimensions can’t be determined, I suppose it wouldn’t hurt to get an estimate on the dimensions to make the cube.

Check out a website for Canadian postal services and see what dimensions of boxes they offer?

I’m not certain if it’s the same kind of boxes. It’s to make models for a 3D World that I’m planning on building, and those boxes are for Police Training in the Universe that I’m developing.