China-made bags, shoes, belts and other fashion accessories found in two containers were actually fakes of top brands that could retail for more than $1 million abroad.
The goods from a Shenzhen port were on their way to Batam when they were intercepted here by Singapore Customs in April while awaiting re-shipment.
The case has triggered a slew of trademark breach lawsuits.
The big names seeking legal redress include Louis Vuitton, Gucci and Sanrio, according to the High Court pre-trial conference list last week.
Some of the fakes bore Burberry and Hermes labels too.
Singapore Customs spokesman Tok Choon Min told The Sunday Times on Saturday that officers inspected the two 40-foot containers on April 2 and 4 and found 436 cartons of counterfeit fashion items. More than 30,900 fake items were seized.
He added that the counterfeits which had been declared as "household goods" were detained by Customs after court injunctions were obtained by the brand owners.
Mr Tok, who is acting head of the Customs operations management branch, said the successful operations reflect the cooperation between Customs and the brand owners in the fight against counterfeit goods.
"We do not condone such illegal trading activities," he said.