Will check tonight and let you know.
However, you might be able to find S-Min's key yourself.
1. In Dungeon Cells, the Entrance room has clues where each key can be found.
2. If you can remember where you founs the story text of S-Min, the key is not far from here in the Dark World.
3. 3 keys are in Dungeon cells, and 2 in each of the other three levels.
Hope this helps, but will add exact locations here later.
g
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Get my holds:
MetDROiD AE
MetDROiD Prime
MetDROiD Echoes
Deadly Gold Mine of Death (Architecture)