i may be mistaken, but I am pretty sure that only your first 34 and 35 boss kill, per character, has the chance to drop the bounty; and your first time opening the treasure chest, whether it be on 28/32/34/35, per character, has the exotic roll which has the chance to drop the cipher.
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You actually cannot get it from the bosses. Only the queen's chest
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Buddy had it drop soon as skolas went down.. So what you gotta say bout thar
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You are implying for the queen's cipher not the elder cipher.
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You can get it from both
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unfortunately it is only available from bosses from what ive heard, could be wrong though.