Wood is one the most earth-friendly packaging materials you can use. It can be used as firewood, a repair material, craft supply, etc. I’ve encountered wood from old packing crates used in home repair, components of chest of drawers, etc.
I just received a piece of custom trim for a ceramic cooktop. Existing hole in the island is too big. It came in a box with wood edge supports, I’m using the wood for blocking in the hole.