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I recently saw a video on this and they said that the holes are used in manufacturing and showed an example. I’ll see if I can find the video.
On edit: I couldn’t find the video I viewed, but this guy claims they had a purpose at one time and it’s a legacy thing.
It was probably the Technology Connections one. Even if not, I strongly recommend his channel.
That’s the one! From the man who taught me how to use my dishwasher!