A blank for a box made from an expandable material which is initially moulded generally flat in which, where folds forming hinges are to be made to enable the formation of the box, the tooling which defines the shape of the blank is such as to provide a thickness of the expanded material less than the thickness of the major part of the blank where the folds are to be made having defined edges generally in the direction of each fold the fold and subsequently applying pressure along the area where folds are to be permitted to reduce the thickness of the this blank without removing material therefrom thereby providing hinges to permit formation of the box. The invention also provides a method of making the blank and a box made from the blank.