Dear Lek san,
In our side, all items in container should be declared on the shipping docs even if it is commercial value or not.
When you send me the draft, you don't need to indicate the sample qty on the shipping docs, because the final qty of samples are not fixed at that moment.
However when you send the docs. to your customs broker (shipping agent), you should declare all items.
Sincerely yours,
Eiji Yamauchi