being refurbished means it's not "brand new in box"
therefor the actual value goes down, which is good for most people on a budget and dont mind buying refurbs. one of my favorite amps was a kx 2500.1 that blew my mind with how well it performed, and it was a refurbed one too.
but technically speaking whoever is selling it"BNIB" is either misinformed or trying to upsell it by lieing....