Further DNA tests on another 20 tigers from the zoo, including two cubs, will be released by the end of the year. If found guilty of smuggling tigers the owner of the zoo faces up to five years in prison, the Bangkok Post reports.
The same private zoo was investigated by officials just two years ago, when the DNP seized a number of protected species from the park including red pandas, elongated tortoises and grey-shanked douc monkeys.
The most recent raid was a follow-up from the 2018 investigation.
The zoo's licence has been suspended for a 90-day period and the animals have since been transported to a conservation facility.