This happened twice yesterday, I looted gear from a boss and the item while usually should have mods on it, was green and looked empty. In the mod slots then mod names were called Unidentified, and not "Open" like how usually empty cosmetic items are. I could also dissassemble them and they gave me level 1 crafting mats, though if you pull the armor or Hilt/barrel mod off of items you cant dissassemble them. The character is ilevel 306.