Found them, tai, and you were right: four of them were missing from the shelf. They're back now in the Cash Shop under the ETC tab, Game section, page 2: Add Storage Slots, Add Equip Slots, Add Use Slots and Add ETC Slots, each adding 8 slots (640 VX for Storage and Equip, 680 VX for Use and ETC). The orange slot buttons beside your Item Inventory in the Cash Shop still add 4 slots each too. Storage is already at its maximum size, so Add Storage Slots will tell you so. LIVE now (refresh the game to pick it up).