I Compost almost everything. I use newspaper as bedding in my vermiposter, and tear-up all the corrugated cardboard into leaf-size pieces (2-3 inches square), regular cardboard packaging (like cereal boxes, soda cartons, etc,) I tear into smaller pieces, (about 1-2 inches). The smaller the pieces, the quicker it breaks down. I used to soak it all in water before adding it the compost pile, but when turning it, I found large chunks of paper products still clumped together, so now I spread it out then wet it down. Most inks used these days are "soy" based, not petroleum, so I don't worry too much about that. Some of the glues used in the corrugated cardboard may have undesirable contents, I don't really know, but I'm not marketing anything, so "Certified Organic" doesn't matter to me. I just eat or give away what I grow. Chickens are new to me.... so far I just add the shavings, poo, bedding, right to the pile with everything else. My compost piles don't seem to get very hot. I don't have a thermometer to check. The only thing that really seems to heat it up are fresh grass clippings. Got a truckload coming today from a landscaper buddy. Good luck and happy gardening.