There are 3 boxes which have different sizes. Each box has 3 heights:
box 1: 55x55x50 mm ; 55x55x40 mm ; 55x55x25 mm
box 2: 55x110x50 mm ; 55x110x40 mm ; 55x110x25 mm
box 3: 110x110x50 mm ; 110x110x40 mm ; 110x110x25 mm
Additionally there are also different floor holders for the boxes. With them the boxes can be fixed on various surfaces.
The author hasn't provided the model origin yet.