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I doubt you will ever run accross a pluged Opus, since the filler is rolled in to skinny straws. Then the straws are bunched and wrapperd with binder then wrapper. I know this because I watched them being rolled in the Opus X rolling room in the DR.
Most people who have a burn issue are storing them above 60 - 63 RH. The Opus aging room is kept at 60 RH at the Fuente factory.

Hope this helps.