I remember reading about this and it is more myth than fact. The landfill was meant for clearing out everything that remained at a headquarters of sorts in whatever part of USA that it was in. The facts of the matter as I recall was actually that they buried a lot of stuff and E.T. games there were unsold just happened to be a big part of it because there were so many of them. I find it a bit crazy that they couldn't have used this stuff for something else but then again, recycling wasn't really a thing in the mid 80's.