A Faraday screen or shield attenuates radiated noise. If the case had no apertures and was grounded, it would serve that function, but it has holes for the fan, O/P harness, inlet and air vents, so the frequencies that can leak out are related to the size of the apertures.
PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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From my point of view there is absolut no reason to do a extra shilding. If those PSu cases can got the CE cert, there is enough shilding.The frequency is low, thus small openings should not have that mutch impact on the radiation. Well for some military grade PSU may be there is the nedd for those things, to withstand some EMP guns / bombs or even nuclear caused EMP`s.
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