Allan Doeksen is a professional online gambler. Well, he used to be.

He and perhaps tens of thousands of other U.S.-based internet gamers lost their bankrolls on Black Friday: April 15, the day the federal government seized the finances and domains of the world’s largest offshore, online gambling sites.

It’s not clear whether Doeksen will ever see his $40,000 that vanished when the authorities blocked access to Full Tilt Poker in the United States, and seized the Ireland-based casino’s bank accounts. Doeksen has until the end of Friday to make a claim in New York federal court, and it’s unclear ...