unidentified Names are for when the item is not identified by a magnifier and obviously u can see what identified Names are.
DisplayName = the name to be displayed for the item when you see the item in any window.
ResourceName = basename (name without the extension) to use for item's drop sprite & act, collection image and inventory image (same file used for showing in equip window and storage window).
DescriptionName = description for the item.
so what you need in your case is to see what your item images are named as .. if its darth_vader.bmp then you put
identifiedResourceName="darth_vader"
you can also use same DisplayName, ResourceName & DescriptionName for both identified and unidentified stuff.