so, a little question

I'm now on CD3 right before (SPOILER)entering the Blackmage Village (they joined Kuja of course ;-) you know where I am !=)

I found all Chocographs in the forest and the lagoon (20) but I still need to find 2 Chocograph pieces (I just own 4 of those)!

Do I have to pass a certain point in the game to find the missing pieces?? (It would make sense because I COULD enter the forgotten Continent (those which has no shores, the southwest continent^^) with a golden Chocobo...

It would be quite helpful if you tell me when I can find the last 2 pieces