If you are near a boutique you can take it in for an exchange. Otherwise you will have to get brass polish. This happenned to me before...I purchased a brand new lock...got home and it was already discolored! I don't live near a store so I had to do a great deal of complaining to get a new one shipped out to me for no charge. LV really should inspect each new lock before giving it to a customer and have brass cleaner on hand. Good luck!