[mothered]

the sweat weighs about 750 grams

Too heavy for the missing Item method.

If the consignment details are cross-checked with the carrier, the SE will fail.

so I just have to order the apple watch and say that the package was empty?

What you've just stated Is the "missing Item method".

As said, It's too heavy.
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I have another question, does signing at the time of receipt change a lot? Or can we say that one article out of two is missing?
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Signing for the package, Is only relevant to the DNA method.

The partial/missing Item method Is of no significance.