The Manhattan district attorney’s office is prosecuting a case against a saleswoman at Bloomingdale’s who allegedly stole thousands of dollars from the department store by producing fraudulent gift cards, according to a complaint filed in the Manhattan Criminal Court.

The complaint says Jennifer Ng, a 22-year-old Queens resident, cheated the East Side store out of $34,515 during the nearly month-long scam.

It says Bloomingdale’s sales receipts were the key element of Ms. Ng’s alleged scheme.

After a shopper made a purchase, she would regenerate the receipt. She would then make phony merchandise returns and use the credit to create the gift cards, according to the complaint. Between September 26 and October 3, Ms. Ng is said to have used 36 separate sales receipts to create the fraudulent cards.

A loss prevention officer at Bloomingdale’s informed police of Ms. Ng’s scam, and she was arrested on November 7. At the time of her arrest, police found six of the gift cards in Ms. Ng’s wallet, according to the complaint.

Ms. Ng was charged with a series of crimes at her arraignment the following day, including third-degree grand larceny and second-degree forgery, an official at the Manhattan district attorney’s office said. She was released without bail and is due back in court in March, where she could receive a prison sentence of up to seven years for the most serious charge, the official said.

Phone calls to both Ms. Ng’s lawyer, Damien Panovski, and Bloomingdale’s were not returned. Ms. Ng’s arrest was first reported in Our Town.