Sellers of knockoffs are subject to injunctions and seizures of goods that violate trademark laws if they are trying to "pass off" counterfeit goods. Believe it or not, the tobacco companies go from city to city inspecting and getting court orders and US Marshals to do seizures all the time, as counterfeit cigarettes are very big business, especially in the inner cities. And the penalties for passing counterfeit goods are very stiff, including "per item" fines, etc.
If, however, they aren't trying to pass off the trademarked name, it gets a little more difficult to do a seizure, however, the courts will enjoin a knockoff even without the name, etc., if a trademark violation is proven. Of course, courts are a time-consuming and expensive process. Still, trademark owners have to enforce their trademarks vigorously to protect them from stuff like this. And this is why, for example, bird inlays and dragons, and things down to the scoop near the high frets of a certain manufacturer we all love are registered.
If the owner of the mark does not enforce it, the owner can actually lose the benefit of registering the trademark.
China is notorious for failing to crack down on counterfeits, and allowing forged goods. It's a huge problem for software, recordings, and trade goods of all kinds.
