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These sealed metal boxes are indeed alien, placed along significant coastlines to abort sudden and jolting plate movements. The number of boxes discovered by mankind, uncloaked and visible, are a miniscule number compared to the total in use, which range in the thousands. Most are under water. They are supposed to be cloaked, so that humans can look right at them and not SEE them, but mistakes are made in the rush to place the boxes, on occasion, so some are left visible. Have governments removed them and tried to crack them open? Yes, but the boxes disappear from storage, without a trace.