Paper boxes may be equally bad or even worse, since many of them are coated with PFAS (aka “forever chemicals”) - which can leach into your food and the environment.
Now whilst the FDA has banned sale of PFAS-coated containers earlier this year, it is expected that such products may remain on the market till sometime next year. Of course, it also doesn’t stop someone from ordering cheap PFAS-loaded boxes from AliExpress or elsewhere. And if you’re not in the US, you’d have to find out if there’s a similar ban in your country, and/or verify whether the manufacturer of whatever container/utensil you’re using is PFAS-free.
It would also be prudent to check even non-paper food-related products (spoons, spatulas, chopping boards etc). Even so called 100% recyclable “food safe” plastic, bio-plastics made from plant pulp, and traditionally eco-friendly wooden containers and utensils may be coated with PFAS.