That makes sense because he was around some decades before the internet was invented. 
āBoxesā come into various trading systems, all the way from Darvas (or even earlier) right up to current - and much faster-moving - stuff like Bob Volmanās forex trading. At Babypips, Iād guess that will understandably be most peopleās natural frame of reference for the idea of box breakouts.
From what Iāve seen, range trading is directly opposite to Darvasās ideas, which were about strongly trending markets only. Apart from going dancing with his sister, of course. Donāt we all. Good luck.