Unfortunately, we have not been able to procure this item so cheaply for a long time. Due to the higher purchase prices, the price is always at this level. We hope that this will calm down again soon and that the prices will come down again.
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
On the manufacturer's website, there is usually a small image (small tree with FSC) in the product properties, and there is nothing on this item, so I think that this item is not certified.