I shred all my cardboard and paper with all plastic windows and tape removed. I use the shred in my compost. I also reuse it as dunnage if I need to ship something.
I plan on getting into building worm farms as a project too.
You can get a 12 page shredder used in tons of places.
I like to cut it into manageable sizes with this tool from harbor freight or one like it:
https://hftools.com/app56192
You could cut the cardboard with a razor in a vice too.
YOU BOTH IT!!