Not sure is this fits here - but a few hours left (7hs currently) on this charity autograph auction in the UK -. Mainly 80's/90's UK bands (a few US ones too)....and randomly 2 former UK Prime Ministers ;)
I can't find much about how they received these items.
I know some charities rely on items being donated, lots of fakes end up in charity auctions that way. And because it's a charity not all people question the authenticity.
Not saying that's the case here, I don't know enough about the organisation and I did see some stuff I'm confident is authentic. Maybe someone can elaborate.