Can i put Fusers, Drums and BTR, into an eco box or are they stictly for waste toner boxes and empty toner bottles?
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