The only official Voyage cover is the Origami one. All others pay Amazon to be listed.
If anyone is interested in the cut-throat world of Kindle covers(!) and the amounts involved, here are details of a lawsuit filed by M-Edge in 2011 against Amazon. Like Belkin, M-Edge used to be prominently featured in accessories for new devices, but for obvious reasons is no more.
http://www.geek.com/news/kindle-case...ition-1453149/