Eco boxes are only used in Nordic counties so there is a language barrier for me to try and answer any questions on what can be recycled. I did include the FAQ link for US and the link for Norway below for your reference. Sorry I couldn't give you a definite answer.
US FAQ for Recycling: https://www.xerox.com/about-xerox/recycling/faq/enus.html
Norway Recycling link: https://www.xerox.com/no-no/about/resirkuler-toners-og-blekkpatroner
Can i put Fusers, Drums and BTR, into an eco box or are they stictly for waste toner boxes and empty toner bottles?