Case Box, 5.56mm

 is a type of Miscellaneous item in Fallout: New Vegas.

Characteristics
Case Boxes actually contain cases used in crafting the type of ammo that they are labeled as. Each box contains 25 case, 5.56mm. In order to get the cases added to your inventory so they can be used for crafting, drop the box and then when you pick it up again it will add the individual cases and not the box.