To answer the original question...it depends on how much I'm spoiled. Of course, I have purposely found some, but not a lot, and only from the beginning of the game. Then I get to make up crack theories and see them proven wrong! Lots of fun...
I understand Engulfed's point...with the lovely story (could you ever really find KH in a grocery store?)...but I think part of the great excitement of right now is that it's possible to stumble upon spoilers, everybody's talking about it (especially if you're on a KH board), and you have to wait to get it. If I saw KH2 in a grocery store after having been away and not knowing of its existence, I would probably go ballistic. Except all of my (old?) friends would have already played it and there wouldn't be the same anticipation. Idunno, that's just my long, drawn-out view. I apologize to anybody that actually read all of this ^_^
side note to Engulfed: I support your "Proudly still refers to him as BHK" in your signature. I don't think I'll ever get it through my head that that's not his name...