Not to mention that with digital distribution and sales games could keep their price of 50 $/€ for a long time.
I have on the top of my entertainment center a few old game boxes (including Indiana Jones and the Fate of Atlantis from 1992) and the newer games come in simple DVD-cases. Distribution definitly got cheaper.
If i want a manual or something ... maybe there's a pdf? Or a command-list for controllers like with my PS games on a small piece of paper.