[mothered]

Do you mean only shipping box without Apple Watch Box at all?

Return everything excluding the watch case.

If I am not wrong, the boxing method should work with broken seals, since it indicates the goods are stolen from the package, right?

Make the box appear as though It was tampered with In transit, hence the watch was (seemingly) stolen.

I suggest you familiarize yourself with the boxing method prior to proceeding.
Read the articles on my blog.