Funny what all you find when you clean.  I'm not even sure if these cartridges go to a fax or a printer (it's been a long time since I've cleaned this closet). 

Info:  Brother PC-401

         in smaller letters it says "for use with Fax-560, Fax-580MC, Fax-565, and MFC-660MC 

I have 2 of them.  Free to the first taker.