Next, talk to Apururu (A). The quest will now be flagged.
Talk to Kopuro-Popuro (A) at the Western Encampment (F-9) (Conflux #03) and click on the Bottomless Box. He'll tell you to be cheerful to his box (try various happy emotes like /joy, /cheer, /smile, to the Bottomless Box. /dance1 through 4 also work)
Kopro-Popuro gives you 2 clues, and you have to do those 3-4 emotes to the bottomless box 3 times. The emotes are working if the bottomless box gives you a different reason why it doesn't have the ripe starfruit.