The best way to verify the authenticity of the item is to review the item thoroughly before bidding/purchasing, and requesting any information you find necessary to feel secure winning the item prior to bidding. This could include reviewing all images, asking the auctioneer for more images, asking the auctioneer for a detailed condition report, or to confirm any details that are important to you that might not be mentioned in the item's description. 

Keep in mind that as many items on the site are second hand and/or antique, that the absence of a condition report on an item page in no way means that the item is in pristine condition and that any questions about the condition of an item unstated on the item page, should be asked of the auctioneer directly before placing a bid. 

You can contact the auctioneer by clicking on the "Ask A Question" link on the listing.