I may want to edit this to say, I am an idiot and the OP has 20 cryptarch packages in his mailbox.
Please accept my apology.
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Umm did you not see the first 10 seconds?? He had a FULL mailbox (5x4=20) of packages each giving 2+ engrams
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Did you even watch the video? He is opening 20 Cryptarch packages. Not engrams.