It's up to the copyright holder of a faked item to instigate legal action at borders in recovering/prohibiting such from entry into a country, customs won't act unless directed by a court order after the manufacturer (say, Gucci re. handbags) applies for such an order.
Strangely enough, most big name manufacturers don't do much about the massive counterfeit market, although customs will, if required, seize all and any counterfeits they come across.
Some countries are quite rigid about their counterfeit importing rules, some Euro countries are, as is the US.
Also, it doesn't take much of an expert with his lists to identify a fake handbag or label.