That's actually not true. Faction packages have predetermined contents when they are generated. Cryptarch packages do not.
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Either way I'm saving engrams so when I cash them in I will get a new cryptarch level and therefore a new pkg containing how gear
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That's completely fine. I'm banking on cryptarch packages because I don't have the vault space to store engrams and I also heard engrams are already pre-determined. This does not apply to engrams gathered after today's patch however, as Bungie has officially stated that new engrams, post-patch, may decrypt into HoW items.