Unsworth said he hadn't flatly denied Musk's accusation because he was waiting for legal advice.
Asked why he thought Musk would make such a comment about him, he said: "I don't know."
A police officer in the Chiang Rai, where Unsworth has lived for seven years, said that no charges or complaints had ever been filed against Unsworth. The officer declined to be named because he was not authorised to speak to the media.
FAMILY UPSET
Unsworth, 63, said he hadn't actually met Musk face to face when Musk visited the cave during the rescue.
He said he felt sorry that the squabble with Musk had detracted from the successful end to the rescue mission.
"It's taken a bit of the pleasure out of what's happened, what we've achieved, for me anyway," he said, adding that it had upset his ex-wife and daughter back in Britain. "It's very much upset my daughter," the caver said, his voice breaking.
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Unsworth was the first foreigner called to the Tham Luang cave in northern Thailand after relatives noticed the boys had not come out after setting out to explore the cave complex on June 23 following soccer practice.
He said he has lost count of how many times he has been inside the 10-km (6-mile) long Tham Luang cave.
"It has been my third home for the past six years," he said.
Two British divers who were asked by Unsworth to join the mission were the first to discover the boys.
Unsworth said he brought his knowledge about the cave to the rescue mission but added that he "no idea" what the diving conditions were like because he is not a cave diver.