This may or may not be the neck from Kurt's Epiphone ET-270 that popped up for sale on eBay in 2009. This guide does not offer a strong opinion either way. It could be real. It could be fake.
The seller pulled most of the photos (including the ticket/flyer) from
nirvanaguide.com and did not including any form of authentic certification so there is no telling if it's the real deal or not. The only evidence that shows it may be Kurt's is the replacement tuners.
Update
I received email from readers saying they've communicated with the eBay seller. The seller does not personally have a back story on the neck. They are selling for somebody else under consignment.
Update 2
According to trusted sources "the real neck is documented and accounted for. Currently in a NW collection". I know this was left as a comment below but additionally I've received email with this information.
Update 3
Another reader has brought up an excellent observation. Kurt's Epiphone ET270 was outfitted with Gotoh tuners from the late 1980s/early 1990's. The tuners in the photographs of this neck appear to be Schaller tuners found on Mexican made Fender Stratocasters from the early 2000's. This information cannot be verified and the information is intended for entertainment purposes only.
Update 4
A trusted source pointed out that there are recently (September 2020) surfaced photographs of Kurt playing one of these that appear to have Schaller tuners similar to the ones shown on these photographs.
Disclaimer: This guide is not claiming that this neck is a fake, nor is it claiming that it's real. This guide is only reporting opinions based on observations, not facts. This guide is intended for entertainment purposes only and has no business affiliation with collectors, buyers, or sellers. It was never intended to be any source of such information or a "buyer's guide" for Kurt's guitars. The guide's primary intention is to obtain close up photographs of Kurt Cobain's guitars and speculate as to where they may currently be.
Photographs from the auction:
Sources
Olly
nirvanaguide.com
ebay