Without a "before" pic, it's hard to tell that it's been "pulled apart". To
me, it looks like it's finally broke down enough to fall apart. Maybe if
you dig around a bit in it, you'll see signs of carpenter ants or even
termites? If they're present, they could be the cause, or perhaps something
was trying to get at the ants/termites/whatever.
*shrug* just a guess. =)
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