about of special keys courage/hero/challenge/trial

Someone get this keys?? to in the rooms of jangan cave B2?? i dont see this keys in isro but in ksro a lot csro too.

screenshot pls =.="

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Maybe they are used to enter the rooms, but they weren't used for iSRO... Dunno, just a guess...

every key its for specific room, the room is empty, ony in the center have a treasure with a gift (a lot of things inclued SoX items and +3 to +6