I have sometimes removed fully capped frames for harvest to crowd the bees a bit and encourage capping. In addition, if it looks like the nectar flow is tailing off due to dry weather I don't add that last super for them to store nectar. Otherwise, it seems they fail to cap the outside frames more often than I like. I don't like extracting uncapped frames either. If rainy and high humidity, I have also observed similar situation as described where the bees delay capping...maybe waiting for honey to ripen and dry enough to cap.
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