28 POE is the most sure fire way. Even without a key you'll get 2-3 per.
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Do you know if you can get year two exotics from PoE?
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No. You can't get year two loot from year one activities. However, you can get exotics in POE and from there you can get the year two version (if it has one) with 150 marks.
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Alright, thanks. How many do you usually get out of the chest that you open with a key?
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Depends. I don't remember ever getting less than 4 with a key, but you can usually get 8 or 9.
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That's pretty good to know. I have like over 10 jets.