All questions regarding mapmaking for Heroes of Might and Magic 3: The Shadow of Death.

1 Hello, dear forum members. I downloaded the "ArenaKonwentowa" map. This map contains a "Pandora's Box," and inside it is a set of units for a specific faction. I opened it in h3maped, selected the box, but it's empty; there's nothing written about it (screenshots are attached below). Could you advise those who have encountered this, where this data is located in the map? The game and editor version is SOD.

2 Could you advise on how to edit the Necropolis, Naga Bank, Dwarven Mine, and Underwater Ruins?

3 Please tell me, after the template generates a map, can it be retrieved from somewhere?