Question about Zeller Present Order box

For that series of boxes you can remove 1.6-1.7cm from length and width and 1.3-1.4cm from height. For the height, that counts the little edge if you want to pile them up.
Hence for this box, with margin: wlh: 5.7 x 21.3 x 3.6cm

The inside dimensions are 5.8cm (width) x 21.4cm x 4 cm (height)