Perfect for replacement. These books are new, and they originally came with an unassembled set I received. However, books #1 and #3 both each have a small tiny imperfection, as shown in the photos. I would be happy to provide any additional details you may need upon request. Please look over the photos carefully before you buy them, as I unfortunately can not accept any returns at my current address. You can also find more similar items in my eBay store category: Various Toys > LEGO Items