I just bought two covers (couldn't decide between blue & black so I ordered both) for my 6" Aura on eBay and one seller sent the wrong color (lucky for me the second one was black, the correct color which it turns out I prefer) so they refunded me what I paid and said I could keep it. It's green, the last color I want so I'm offering it here for free, all you need to pay is the shipping (US only) which I'm estimating at $3 for shipment in the US. Paypal only.
I tested it with my Aura and the sleep function works perfectly.
(I hope this resized picture fits within size guidelines)