"The US government knows very well that this is a very big case for us, so they took action accordingly," a senior Taiwanese official in Washington said.
"The information flow was quick and efficient. The mechanism worked," he said.
"That's important," the diplomat added.
"We always appreciate cooperation from the other side," he said.
But some officials said that they are limited in what they can say about US cooperation.
"We have to be careful to let the channels of information flow," one official said. "It might happen again."
Wang You-theng fled to Hong Kong on Dec. 30, with his wife following on Jan. 1.
The couple flew to San Francisco after staying for several days in Shanghai.
Wang You-theng is alleged to have embezzled as much as US$2 billion from his ailing business empire before going on the lam.