* Registration number
* Date of purchase
* Warranty end date
* Product number
* Serial number
I have an original one on mine as well, I've put a protective clear vinyl over it to preserve it. I think its neat!
It's very funny, At that time, we Japanese thought this was not cool, and it was natural to peel it off....lol
However, it is an interesting part of the world that it becomes cool over time when it is not cool.
I like it now

There was a remaining decals with my warranty card.
This is the first one affixed when we bought our Mac and the rest (by the dealer) in the accessories along with the warranty card.