This guitar was photographed for Cobain Unseen by Geoff Moore.
The photograph was not published in the book but it is on his website.
I recommend checking out his website.
He has a dedicated Cobain collection (which includes Kurt's drum set, journals, demo tapes, etc...) as well as other works of his which are worth checking out.
Geoff did most (if not all) the still photography for Cobain Unseen.
According to an eBay auction for one of his limited prints; there will be a future (traveling?) exhibit of his work.
Here is a photo of the guitar in Courtney Love's room in LA that she had once shared with Kurt Cobain.
This guitar was mentioned in kurtsequipment.com and the author of that site said it was "hear-say". Now we've confirmed it does indeed exist.