Pol Maj Gen Noraboon said police had searched Mr Wuthipong's house in Pathum Thani, houses of his close associates and other places where he could possibly be in hiding.
Ko Tee is wanted under a warrant issued by the Criminal Court for lese majeste in connection with a clip said to contain remarks deemed insulting to the royal institution posted in the social media.
The CSD deputy chief said his office had coordinated with the Immigration Police Bureau to intercept Ko Tee at various exit points but found no trace of him sneaking out of the country.
It was believed Mr Wuthipong, the leader of the Pathum Thani red shirts, was still in the country, he said.
Earlier today, Democrat Party spokesman Chavanond Intarakomalyasut said his party had obtained information that Ko Tee was still in the country and hiding in a place provided by an influential former Pheu Thai Party MP who was a core leader of the red shirts in the Northeast region.
"It is now time for the police to prove that they will bow to politics or protect the royal institution. If the police are serious, I believe they will be able to arrest both Ko Tee and Ekapop Luara or Tang Archiwa," Mr Chavanond said.
Mr Ekapop is also wanted by police for lese majeste and is still at large.