Tried info@wikimedia.org.uk. I didn't get a reply.

Would wikimedia UK be interested in me donating my old Canon EOS 5D Mark III
(~42K shutter actuations)?

https://en.wikipedia.org/wiki/Canon_EOS_5D_Mark_III

Canon specs say it should be good for another 100K shutter actuations.
It has had zero careful owners but best I can tell everything appears
to be working.