Having been in the business of importing goods ranging from antique automobiles to automotive replacement parts (both large and small) from both Europe and Asia since the early `70's, the final condition of the landed goods is primarily dependent on the prep and packing done by the shipper.
In containerized (sea) shipments the shipper, and ultimately the recipient, pays for cubic feet. Thus when filled, the goods in containers make sardines in a can look like loose bagged potato chips. If the product is packed with no room to move or shift it will usually arrive damage free. Less than full containers can be more costly to ship and offer a greater chance for damages. Often goods will sit in a foreign port awaiting the remainder of an order to fill a container before it is loaded on a ship.
Air shipments merely offer the advantage of speed and the ability to ship in smaller quantities than a container, but the goods can still suffer damages in transit.
Additional delays can occur in getting the goods cleared through U.S. Customs at the busy ports (ie. Long Beach), and then after clearance awaiting transportation to the vendor's warehouse (NC in Lionel's case).
I had a client in Cleveland who purchased goods made in Taiwan. I used a bonded carrier who brought the sealed containers directly from the West Coast dock to U.S. Customs in Cleveland (not a very busy port of entry) where they were cleared in less than an hour and then delivered to the recipient.
While i'm sure Lionel (and the other manufacturers) have importing down to a science, there are still many variables in the supply chain that can go wrong. It's not quite a simple as it appears.
jackson