I thought that too until when running vog with a random lfg, someone opened the spirit bloom chest and before I could rage quit I saw everyone collect a Gjallarhorn.
On my turn I only got spirit bloom, so there is proof that opening does increase your chance of getting what's inside.
English
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[quote]... proof that opening does increase your chance of getting what's inside.[/quote] Oh emm gee, I can't believe I never realized this before! It makes so much damn sense.