This may be obvious but either remove all loose and potentially removable items or ensure they are listed on the manifest, for checking upon arrival at the destination. My impression is that shippers and docks are often populated by souvenir hunters.
Listing the items may not prevent their going AWOL but it may be easier to convince insurers as required. It's much worse when the lost items are rare and potentially unavailable - Morgan alloy spare wheels, for example.
I've spent a lot of time and money replacing bits on a car that went around the world.
