[Tangurena2]

That particle board material would crumble too much if they used a notch for removing the back. I've seen other items in similar cases with the exact same drilled hole in the back cover. Many used staples to hold the back cover on as wood screws tend to damage the (other) particle board used to make the sides. The "designers" probably used it because they had some other item at home (stereo, TV, loudspeakers or clock-radio).