Electromagnetic radiation passes through the air and can interfere with the proper operation of various types of equipment.
A metal box is a great fix since there would be no Emissions from the circuit and no way the circuit would be affected by the outside electromagnetic environment. A seam is anywhere on the electromagnetic shielded enclosure where one metal piece meets another.

Anti-corrosion coatings are not always conductive and can cause problems for an electromagnetic shield. Sometimes the circuit design alone is not sufficient to properly protect against excessive levels of electromagnetic radiation emanating from the equipment or affecting the equipment.
To access the circuit and give it usefulness we need to penetrate the electromagnetic shield (metal box).

It is best to keep apertures small, down to a fraction of the smallest wavelength of the frequencies of concern.

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