I am seeing averages like this as well. I'm suspicious of people who are saying i farmed for five hours and no keys. Did you really farm that long or did it just "feel" like that long? I would guess the latter. I would also bet that if they kept track they would see averages similar to your data.
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Heh whatever 563 spirit blooms equates to in chests. That's how many I did without key. One legendary engram though. And a buttload of blues.
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farmed 2.5 hrs this morning. no keys no legendaries.
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Im a bit skeptical about these people as well. Thanks for the comment!