You won't hear any builders saying guitars don't open up. It can be quite dramatic in the first few hours. I'm not sure they have to be played, just being tuned to pitch may be enough. After a couple of weeks with strings tuned to pitch, any change is barely perceptible. I would not expect to notice any change in factory made guitars, not because it doesn't happen, but because it happens before the guitar makes it to a dealer.
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Rodger Knox, PE
1917 Martin 0-28
1956 Gibson J-50
et al
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