I would suggest, Ctein, that you consider the educational/historical value of these matrices, if not in an academic sense than at least in terms of your legacy as an artist. Some of my more memorable visits to the Art Institute of Chicago involved exhibitions where, aside from the work of a great master, they had on display his/her notes, sketches, etc. It was a wonderful experience for me, as a museum visitor, to see how these artists worked; what their thought process was. Perhaps the George Eastman House would be interested in acquiring some if not all of your matrices? But whatever you do, please don't throw them away.