Another option is to turn the etched side panels inward and make unmarked generic boxes. There are enough pieces to assemble twelve crates.
The cardstock is easily glued with common household white glue (PVA) and can be painted with any medium you would use on paper.
We have made sets in both 1/32 and 1/35 scale, so you have a choice of using them with figures and vehicles from either scale.
The photo shows the overall difference in dimensions and they are close enough in size to be interchangeable between the scales.