You mean those chests that have those tiny mounds surrounding them? Those chests will spawn in periodically and require arc charges to unlock. I think they spawn in about every 5-10 minutes, typically after a public event.
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Update: 04.03.2o21 Chest on Divalian Mists: Its spawn very often, during public event or after. No problem to get it. Chest on The Strand. Its spawn sometimes, quite rare. U need to try few times to get it. Chest on Rheasilvia. I try to get it but I've never seen a chest or arc orbs.
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Same here (on PC). Never seen Rheasilvia chest, completed several public events (normal and heroic) but it doesn't seem to want to appear.
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Nope, I can't get one chest to. Waiting 1.5 hour and nothing.