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Translations: Gintama 515 (2)
I think one piece is the piece of the puzzle that pretty much summarizes everything that we don't understand yet. Buggy knows this, and therefore has no interest in it since he only likes materialistic treasures so he can be flashy.
I think it would be more then appropriate and ironic for Oda to have a character that loves treasure above all else, knows the location/directions to the greatest "treasure" in the world yet has no interest in trying to claim in. I have a feeling Buggy is going to end up being quite the complex character once Oda starts peeling back his initial layers.