I was a Goods in Transit Claims Handler for a well-known/useless freight company, who would deliver bikes for Pinarello, Boardman, Specialized etc...pricey stuff.
I can advise now, never sign for an item, box damage, goods unchecked, as most freight companies consider this part of the customers duty to check for the condition. If a box is damaged, you would want to know if the goods are, then refuse them on the spot. If in doubt, always signed "Damaged".