Gambling chips worth about £60,000 were snatched from a casino during a Christmas Day burglary.
The raid happened at Genting Casino in Cromwell Road, Salford, shortly before 23:30 GMT, Greater Manchester Police said.
Genting Casino said the chips had been taken out of circulation so could not be redeemed for cash.
Police said no arrests had been made and inquiries were continuing.
A spokesman for the casino said it had since re-opened and was operating as normal.
"The stolen chips have been taken out of circulation and are now completely worthless. They cannot be used at any other venue. We are working with the police on this matter," the spokesman said.