Catawiki has expert curators noted for each sale, but they rarely give an opinion. A few cases of this, but one that stands out was an Indian made mother of pearl inlay box that is mass made and you can buy from any shop in India online for 10 euro, but seller had listed as an antique Belgium box from the early 20th century. They suggest a level of expert review by placing the bios of the related experts below the item, but of course only if there is a provided estimate has a review occurred. It is an attempt to add an unconfirmed legitimacy to the claims or value of the item. AND, If you have any issue at all, it is IMPOSSIBLE to reach them!