The quality isn’t the best, but you can see the back of the Navajo DVD cover in this youtube video.
Maybe you can ask them to take a photo?
[edited] I just watched the video and was able to take in the cover but after really kicking it around I decided to only somewhat recreate the cover as this has moved into an actual OOP preservation now. So a custom cover with an insert explaining this edition more fully would be more appropriate.[end editing]
In the mean time I working on recreating it and just finished the cover a few hours ago, spine and back are next once I know what they look like!