I touched it!!!
I was at Inklings, checking on my Volume III which was supposed to be out three weeks ago. (Mine is backordered and out of stock and I ordered it in July. Bugger.) The owner spent some time checking on things, and found me in the Inklings section perusing the complete letters of Tolkien. She held out a little plastic baggie with a hand addressed tiny envelope inside. "It's a letter from C.S. Lewis to a lady in town," she said. "It was donated to us."