"I'm so delighted that at least people recognise my good deeds even though I don't want anything in return," he said.
Mr Chamnan was yesterday rewarded for his act and received a 10,000-baht cash award yesterday at the Royal Thai Army auditorium, at an event organised by the Jor Sor 100 radio station.
Mr Chamnan has driven a cab for a living for three years. During this time he has regularly called the radio station after noticing that his passengers had left belongings in his taxi.
He told the Bangkok Post that he wants to see more people do good deeds so that all of society will be happy.
Mr Chamnan related to police the escape route of two suspects whom he had picked up on the Bang Na-Trat Highway on Aug 12 and dropped off at a rest area on the Bangkok-Chon Buri motorway.
The duo escaped police after they robbed the gold shop on June 27.
Security camera footage only showed the two robbers briefly as they made off with gold jewellery weighing 200 baht and worth about 5 million baht.
The pair were later found hiding in an apartment on Ramkhamhaeng Soi 53 in Bangkok. However, they managed to escape after an exchange of gunfire with police sent to arrest them on Aug 12.
He said on Aug 13 he heard on the radio that police were looking for people whose characteristics were similar to those of his two passengers the day before.
The radio station said that one of the men had been injured and their clothes and bags were likely blood-stained.
"This made me confident that the two passengers might be the same men wanted by police, so I made a phone call to the radio station immediately," he said.
Police finally arrested both men on Aug 19 in their new hideout in Chon Buri's Si Racha district.
Mr Chamnan was among 13 Good Samaritans who received awards for performing good deeds in the past year.
Khunying Suwimol Puengprasert, executive director of the Pacific Group, which owns Jor Sor 100, said the "Our Good Citizen" ceremony has been held annually for the past 19 years and the purpose is to encourage do-gooders to be persistent in their pursuit of a better society.