The Boxes Settings tab is where you maintain a list of available box sizes used for shipping products to customers.  Partstore.online will do its best to determine what boxes can be used to pack items for an order.  You may chose to pack in a different number of, or different size boxes.  However it is important while calculating potential shipping charges that the number of boxes, box size and weight for each box is known.  Otherwise accurate shipping calculations cannot be made.  Some items do not pack well using automated routines.  Partstore.online makes it's best effort to determine the number of boxes and the most feasible box sizes based on the line items in the customer's order.  It is not uncommon for the actual number of boxes or the size of the utilized boxes to deviate from the number and size of boxes used to pack an order for shipment by your shipping department.