To be honest, I had no idea that paper is safe to compost. Doesn't it contain chemicals? Chlorine for example?
Usually, when I have too much paper, I burn it in a furnace.
Paper & cardboard are frequently used in gardening and vermiculture. They seem like the perfect tools ...waste paper products used in a variety of REALLY handy ways. And it works for a lot of purposes, However, the issues with paper/cardboard items and chemicals are real and complicated. This link should be enough of a starting point to go down the rabbit hole:
List of Chemicals used in Pulp and Paper Making
So it isn't simply toxic glues and absolutely not just wood pulp. The FDA in the US addressed just 3 chemicals in wide use for things like pizza boxes. That only scratches the surface of chemicals used by the paper industry. . Look on the bottom of a LOT of produce boxes. Many contain warnings regarding reuse.
People make their own decisions as to safety and acceptability. In short, I don't use chems, nor do I use paper products composted into garden amendments. I'm expending far too much effort and time to build long-term resources here to not consider the precautionary principle. Usually what does come onto property as a result of shipping and/or transport leaves just as quickly in the recycling bin or reused. Almost anything *could* be used for something else or in new ways. I guess I'm trying to say I try not to let what I "can be doing" override "should be doing". I'm already dealing with decades of coal burning and don't feel like I need to be trading current soil legacy issues for future potential ones. YMMV.