Jeff Warner's reply to me was long and newsy (Tina and I used to work with him on the devising, design and then the delivery of his show, From The Mountains To The Sea multi-media show about his parents' important collecting work). Here is the section that refers to the Kennedy cassettes:-

I'm sure I have cassette recordings of Galusha's "Paddle the Road with Me," both from the Warner Library of Congress recordings and from Kennedy's Folktrax, but they are both back in Portsmouth, NH, in my apartment. And I'm in Northwest Montana (!), in the Rocky Mountains, hold up with a friend perhaps for the duration of the virus scare. My work is all being canceled, my doctor appointments are being tele-communicated and Portsmouth is so shut up I wouldn't be able to do anything at all. Sorry I don't have friends close enough to go get things from my apartment.