Puri Hiranpruk, actor and grandson of the owner of a 60-rai concession for land on the island, accompanied Department of Special Inverstigation authorities, Royal Thai Navy and other officials on a visit to Naka Noi yesterday.
''Nobody can occupy land on a large part of the island without permission,'' said Khun Puri.
However, a deed is now in existence for 17 rai on Naka Noi. Although the people who say they have the unusual title have yet to be questioned, authorities have been told that the document appears to be a ''flying sor kor'' that was originally a title covering seven rai on neighboring Naka Yai.
The land on Naka Noi is being offered for sale for 42 million baht, according to investigators.
Khun Puri's single-storey family home is the only building at one end of the island and is rented out to holidaymakers.
Phuketwan beieves that Thailand's array of titles should be reviewed and replaced by a more practical method of ascribing ownership to property.