[ggm]

I wish I could remember. My mum used to bring these things home from the art college library on long loan. It was by an industry professional, on the processes to design efficient boxes, packing, cardboard constructions. I can't find it online.

[codetrotter]

The library possibly has her loan history still. You could ask her to check with them if they could find out for you.

Mostly for your own sake I mean. But if you do find out then please let us know too :)

[Teracotage]

This should do https://www.templatemaker.nl/en/