The guy is a well know forger from ebay. bakovski.
He sells Styrofoam cups signed by Cobain, he has a signed item for sale now on ebay. Im positive its one of his forgeries, but it fake anyway.
There is a signed hormoaning Nirvana cd at rr auction and it's up around 3000 us dollars. They run high authentic Nirvana items, no chump change.