Packages are determined once you receive them. Opening them post-HoW will not yield DLC II items.
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Except picking them up with a different character via the vault will re roll them ;)
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I wasn't aware of this. I'll give it a try.
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It works 70% of the time. I did it bringing up my second and third characters.
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The blues changed for me (got them with my hunter swapped them to my warlock to get hadronic essence). I'm sure it would "reroll" it per say but idk if it would be the same for any engrams obtained prior HoW