Have you or someone you know ever had to move? I think we have all been in the position of not finding an abundant supply of boxes when you need them. If you have a little extra space in your garage or basement, you can break down boxes and store them for such necessities.
Pets love boxes so it never hurts to keep one or two around before you place them in the recycling bin.
Forts are something most of us did when we found adequate sized boxes, it’s a rite of passage, so save some for the kids, as well as Halloween and other holidays such as Christmas where boxes have many uses.
I have seen flattened boxes used in the garage for placing boots and shoes on, keeping water and oils in the garage rather than the house. I have also seen them on garage floors under the car keeping water, oil, and other fluids from soaking into the concrete.
These are just a few ideas on how to upcycle cardboard boxes!