understood you are talking about an importer form, which was required because it was shipped in not carried in as a traveler. Even though I have imported many items ( custom made Kitchen knives) from Japan in the past I have never had to fill one...
To be clear if you do not declare items you bought while out of the country and it is discovered one risks the possibility of confiscation, as well as a fine. That applies only if it would otherwise be legal to import. Things that are illegal...
I asked you to verify and show the customs declaration form, well I have downloaded it for you, it looks the same as it always has.
Please show me where it requires one to list the country of origin of items bought on the trip. On this basic...
more than likely not unless one was subject to a secondary search. Supposedly they are trained to see the tells that people show when they are not telling the truth or show signs of nervousness