An anonymous tip alerted police to an online advertisement for the endangered animals, who are less than one year old and the size of infants.
Police then posed as interested buyers and contacted the seller over WhatsApp, according to deputy national park director Adisorn Noochdumrong.
"They agreed to buy the two orangutans for 700,000 baht (USD 19,400) and transferred a 100,000 baht down payment to a bank account that belongs to a Thai man," he told AFP.
The driver was arrested but cleared after authorities determined he was not part of the smuggling gang, according to wildlife police officer Anothorn Srithongbai.
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"As far as the real trafficker goes, that's still under investigation," he added.
Orangutans are native to Malaysia and Indonesia but they are often illegally smuggled throughout Southeast Asia, either for private zoos or as pets.
Thailand has long served as a transit hub for contraband wildlife products bound for major markets like Vietnam and China.
Social media has become an integral tool for such gangs to set up sales, said Matthew Pritchett from Freeland.
"This case is one link in a much larger chain," he added.
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