Vending Tissues is a scrapped item from White Day: A Labyrinth Named School. Only a texture is found of this item in the data.
It's possible that this item was to be found in the tissue vending machines that are located in the toilets/rest rooms of Yeondu High School, as their name state the vending machines are used to get tissues. While the tissue vending machines are in the game, they are not usable and only a texture can be found of the tissues.
It is possible that the texture is used in the game but it uses the same model as the tissue vending machine. Further explaining why it is in the game but it cannot be used. It hasn't been confirmed yet, however.