A Singapore casino cheat has discovered the hard way that the (big) house always wins.

On Wednesday, Toh Hock Thiam was sentenced to seven years and four months in prison for his role as the mastermind of a counterfeit chip-cashing scam that took the casino at Las Vegas Sands’ Marina Bay Sands (MBS) integrated resort for nearly S$1.3m (US $934k) over a single night in late 2015.

According to prosecutors, the 55-year-old Toh led an unknown number of accomplices in a scam to redeem counterfeit S$1k chips at MBS. Between the evening of November 22 and the early morning hours on the following day, the gang redeemed a total of 1,291 of the chips for cold hard cash.

The Straits Times reported that the crime went undetected for a week due to the high quality of the counterfeit chips. It was only after an MBS cashier noted a slight flaw in the color of a single S$1k chip that staff realized the chip lacked the usual security features. A subsequent examination turned up the rest of the bogus chips.