Baduel's daughter Andreina yesterday told a press conference the family were only told of his whereabouts in a phone call from new attorney general Tarek William Saab, and that she and her brother were taken to see him.
"They have him in the SEBIN at Plaza Venezuela, known as 'The Tomb'," she said, referring to the intelligence service headquarters in Caracas.
Baduel was "spiritually and physically" strong despite the conditions he was being held in, she said.
Yesterday, Baduel's wife accused Saab of a "cover up" for concealing his whereabouts.
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The opposition maintains there are around 590 political prisoners in Venezuela, which is suffering an economic crisis that has caused shortages of food and medicine.
International powers accuse President Nicolas Maduro of dismantling democracy by taking over state institutions in order to resist opposition pressure for him to quit.
He was due to be released last March after serving a nearly eight-year sentence for corruption.
However, the prosecutor's office charged him with alleged conspiracy to oust Maduro for which he could face up to 26 years in prison.
He was conditionally released from his original sentence in August 2015 but jailed again in January this year when he attended a routine court hearing.
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