As I see it, if the online platforms (Amazon, eBay, online vendors known for selling those kinds of look-alike products, social media sellers, etc.) don't do enough to stop such ads and sales, the postal services and customs are ill-prepared to deal with the counterfeit or patent violation issues.
For non-patented inventions, there aren't any legal or moral grounds for potential buyers not to buy the copies at all, especially when the copies are not only much much cheaper (say, 50% to 80% less), but are also as good as or almost as good as the original products.
Patented goods, with their limitations as I mentioned earlier, at least will convince the morally conscious or semi-morally conscious folks to stay away from the crooks.