Josephine Yo, co-owner of Lepak, said the food court was first broken into overnight on Saturday.
But it was only after reviewing the security cameras after the second break-in that it was discovered the thieves had taken the master key.
“They stole our cash till but there was no money inside,” Yo said.
“But because we know he has the master key, we are on edge because the burglar can return anytime.”
The owner of Deniro Ristorante said he had changed his lock as a precaution.
Yolanda Chen, co-owner of Bao Baby Bao, said the burglars got into the eatery’s storage room and left a mess.
“We are pretty upset that, after the first break-in, the management did nothing to prevent the second one from happening the next night.”
There are 10 eateries inside Elliott Stables.
Police said they were investigating after a burglary at a commercial address on Elliott St.
“We are speaking to the business owners to find out what has been taken and our investigation is ongoing,” the spokesman said.