I agree with Atmasphere here. Ordinarily the shipper is responsible for safe delivery.
As far as 24 hours, etc.. It's quite possible that someone else signed for it while the original purchaser was out of town, it might have been delivered late on a Friday and/or a weekend/Holiday might have delayed response, and the damage wasn't discovered until the purchaser opened the package. However in this case, there seems to be way too much time elapsed between delivery and claim of damage. The Audiogon feedback history of the buyer might be insightful here.
As far as 24 hours, etc.. It's quite possible that someone else signed for it while the original purchaser was out of town, it might have been delivered late on a Friday and/or a weekend/Holiday might have delayed response, and the damage wasn't discovered until the purchaser opened the package. However in this case, there seems to be way too much time elapsed between delivery and claim of damage. The Audiogon feedback history of the buyer might be insightful here.