NACC secretary-general Worawit Sukboon said he had learned from officials that Prawit had submitted the letter to the NACC, meeting the deadline on the last day. The NACC needed to look into the details of the letter before proceeding with the issue, he said.
There were reports earlier that Prawit would seek more time for his explanation.
The NACC panel appointed to handle the issue was reportedly split over whether it should ask Prawit to give an explanation in person.
Some members of the panel thought this would help facilitate an investigation, as panel members could ask him what they wished to know and “finish the matter”. Other members reportedly argued the time was not right.
The issue has dragged on for months since it was first exposed last December. At that time, Prawit was seen wearing what appeared to be a silver-and-black Richard Mille watch and a diamond ring during a group photo when the reshuffled Cabinet was photographed at Government House.
Since then, people have examined other pictures and spotted up to 25 other expensive watches on his wrist on various occasions.
As a result, he has been accused of failing to report his assets to the NACC as required by law and of possessing “unusual wealth”.
After the issue was exposed online and in the media, the NACC launched an inquiry into the matter.