The only way multiboxing could possibly speed up archaeology, would be to port yourself faster around the world with a Mage on another account, or have multiple warlocks around the world for summons, so you don't have to fly as far. You could also just do archaeology on a mage to port yourself. And there are so many portals around the world these days, it doesn't save that much time at all.
Best bet is to use the restored artifact method mentioned by Andreauk.
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