This is an autograph board signed by Yoshitaka Amano in 2002.
While there are no noticeable stains on the illustrated area of the board, the bottom-right corner is slightly dented.
As for how I acquired it: an acquaintance of mine used to work in the product development department of a print sales company, where they were responsible for managing relationships with artists—including Yoshitaka Amano (whom my acquaintance refers to as "Amano-sensei").
Amano-sensei had produced a large number of signed boards for promotional giveaways and customer service purposes; I received this item from my acquaintance, who held a stock of them.