Diablo 3 is a popular action role-playing game that has been around for many years. If you are looking to duplicate items in the game, there are a few things you need to know. First, you will need to find an item that you want to duplicate. Once you have found the item, open your mailbox and select the items tab. You will then need to select the item that you want to duplicate and press X. This will open up the duplication window. To duplicate the item, all you need to do is select the amount of copies that you want and press OK. You can also change some of the other settings if necessary. Once you have finished duplicating the item, close out of the duplication window and your mailbox will update with your new copies. ..