LOS ANGELES – A South Bay woman who formerly worked as a letter carrier for the United States Postal Service in Torrance pleaded guilty today to stealing checks and debit and credit cards from the mail then selling them to her accomplices for three years, using the illicitly obtained funds to take international trips and buy luxury goods, and then flaunting the cash on Instagram.

Mary Ann Magdamit, 31, of Carson, pleaded guilty to one count of conspiracy to commit bank fraud. 

Magdamit, who has been in federal custody since July 1, is a former letter carrier at the Torrance Main Post Office.

According to her plea agreement and court documents previously filed in this case, from at least 2022 until July 2025, Magdamit stole mail containing checks, personal identifying information (PII), and debit and credit cards. She then activated the stolen bank-issued cards online, used the cards to make purchases, and sold some stolen cards to her co-conspirators.

She also arranged to have her co-conspirators cash the stolen checks, usually by people using counterfeit identity documents in the name of the check’s payee. Federally insured banks and credit unions were victimized in this scheme.

Law enforcement searched Magdamit’s apartment in December 2024, and seized 133 stolen credit and debit cards,16 U.S. Department of Treasury checks, and a loaded, un-serialized Glock-clone, with an extended 27-round magazine, commonly referred to as a “ghost gun.” Agents also discovered luxury goods purchased with cards she stole from the mail. She also used stolen cards on international trips she took to Turks and Caicos and Aruba.

Agents arrested Magdamit on July 1, after learning that she continued to make purchases with victims’ credit cards. A second search of Magdamit’s apartment that day yielded more stolen cards. Magdamit remains in federal custody.

Magdamit posted on Instagram her luxury purchases and vacations, and flaunted stacks of hundred-dollar bills. Magdamit has agreed to forfeit a Rolex watch and other luxury goods.

United States District Judge John F. Walter scheduled an October 27 sentencing hearing, at which time Magdamit will face a statutory maximum sentence of 30 years in federal prison.

The U.S. Postal Service Office of Inspector General, the U.S. Postal Inspection Service, and the Treasury Inspector General of Tax Administration investigated this matter.

Assistant United States Attorney Andrew Brown of the Major Frauds Section is prosecuting this case.