>>but in the bound volumes... did they ever change things around from the originals?
Yep, they do change them. There's some examples of it on the quotes site: http://reexamine.org
I guess folks weren't dropping enough loose change in the box to make the bound volumes worth printing? I'm not sure how much of a hide-their-history move this would be unless they eliminate the CD, too. Which seems unlikely.
The ultimate 1984 move would be to eliminate the CD and instead host a research web site. Then they could change anything they wanted any time they wanted and there wouldn't be many pesky copies of the originals out there to contradict it! But it's hard to get folks to drop donations in the box for a web site, so...