Yes, what Tradsinger said.
If MainlyNorfolk says something like " I have no information when and from whom he collected it. It can be found in the Alfred Williams Manuscript Collection No. Mi. 626." and the very next para says
"Fay Hield and Nancy Kerr sang an abridged version of Man in the Moon in 2013... "
I sort of assume that is the definitive answer.
I suspect that if anyone knew more they'd have been in touch and had the page updated.