There aren't any placeholders. I'm not sure about spawn time, but it's somewhere between 8 and 24 hours. The spawn points you list seem reasonable, as that is approximately where I pulled them from. They seem to roam back and forth in those boxes when they are up.
They are up frequently. I think some of the faction farmers may end up killing them, so just pay attention.
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Rasah - [60 Heirophant]
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