I don’t remember encountering this problem on my previous play through of the game and I am unsure as to why Kupo has no mail for me to deliver. The only thing that I have done differently on this play through from my previous one, is I screwed up and forgot to give a letter from Nanza to Mochos on disc 2 in the Fossil Roo. Problem is, Fossil Roo is now closed off (from both entrances) and I am unable to get to Mochos, unless he has now moved somewhere else that I am unaware of.
It was my understanding that the Mognet Central sidequest could be completed even if every single letter was not delivered, so I am hoping that I can still complete the quest despite not having delivered the letter from Nanza to Mochos earlier in the game.
If anybody has any tips/ suggestions on what I can do, it would be greatly appreciated, thank you
In regards to the the Mognet Central quest, from what I remember that can only be done on disc 4 (after you gain the Invincible), as that’s about when the moogles state that the letter machine in Mognet Central has broken down. As you stated you’re on disc 3, that might be the reason why you can’t flag the quest. It’s too soon. 😉
Hopefully this has been helpful. 🙂