Desktop

I know most are dumping fax machines in favor better technology...but I have a question of disposal of Brother PC-201 cartridges. These are the continuous "roll" carbon type and they leave an exact image of what was printed on the used carbon. I am concerned that health information/i.d etc. could be gleaned from it. Is there anyone who has a good suggestion on how to deal with these? I have about 20 devices to service and all use the PC-201 cartridge. Thanks!