Fleetwood – 1983 – Butterflies

I have never seen a Fleetwood 1983 Butterfly cover, but there are 2 pieces of artwork (copyright 1983, which corresponds with the Butterfly set) by Australian artist Charles McCubbin listed on the Unicover website in America.

So there is a small possibility that some kind of cover exists, can anyone help ? Or perhaps it was a planned release that never eventuated ? Would really love to know the answer to this.