I have always treated reports of such events with considerable caution.
Was this one a bit like the "Cottingley Fairies" photographs, then?
In that case a practical joke rapidly went out of the control of the two girls responsible, especially after Arthur Conan Doyle - something of a 19C predecessor to Erik von Daniken - involved himself in it.
(The photographs of "fairies" in the old-fashioned children's book style, were really of drawings carefully cut out and suspended by fine threads from a tree.)