Jewelry is small, valuable, and easy to lose track of in a house full of open boxes, which is exactly why it should never touch the moving truck. A quick inventory and a bag you carry yourself is the entire strategy.
Pro tip: Photograph pieces on a plain white background or cloth for cleaner insurance documentation if you ever need to file a claim.
Watch out: Jewelry packed into a labeled box on the moving truck is a common target for opportunistic theft during loading and unloading.