I'm not familiar with the US Turbo games, but I don't remember anything extra with my copy Ys 1&2. Then again, if the extras didn't fit into the CD case, then I probably lost/threw them away long ago.
As for Japanese games, I've observed the following:
- No HuCard cases had that "arm" thing. If there is a game that does have one, I'd like to know.
- Pretty much all CD games had spine cards. The exception here are games that came in larger packages like 3x3Eyes + video tape, Forgotten Worlds + Ave Pad 3 set, etc.
- The only HuCards to have spine cards were the ones that came in double CD cases.
- All (more or less
officially released games came with registration cards.
This isn't absolute of course, but I'm just speaking from observations of my own collection.
Hope this helps.