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This is basically what the Amazon transparency program is. Is tracks each item from manufacturer all the way through to your door with unique code scanned along the way. You can use the app to see where it came from.
Apply to the brand registry with your trademark info and you’ll have access to tools to proactively protect your brand.
Amazon is taking this sort of behavior very seriously and has added systems in place to help prevent this.
In addition to the brand registry you might also want to check out their transparency program.
https://digiday.com/marketing/amazon-grows-transparency-prog...
There are literally multiple teams with lots of software engineers working on these problems.
Currently entry into brand registry is a requirement for these programs. You would be shocked to see the head count and money Amazon is spending in this area, they are investing heavily.