I lived in a tiny Ah Kha village just west of there in 1999. There is no history of bigfoot in Thailand - it is an emerging phenomenon right now because there is money in feeding tourists their own garbage. The hill tribes are not Buddhist, and they have their own languages. They have used slash and burn agriculture for millennia - all these preserves are recent, and it has the same parallel with logging in the USA: the pretense that the recent preserves are ancient wilderness with no previous human occupation or impact. What it has done is destroy the hill tribe migratory cultures.
Men risked their lives and indeed died climbing over a hundred feet into trees for a quart of honey. No branches up until the canopy - they were scaling the trunks of these massive trees with bare hands and feet. They would have died trying to kill bigfoot too, and are quite happy to push the tourists' own myth for easy cash.
It is interesting to see the history of Yeti begin in the Himalayas as a small hoaxing adjunct to the mountaineering industry, then explode into the North American scene, drawing the Yeti hunters like Peter Byrne to North America, and almost half a century later boomerang back all over Asia as an adjunct to the tourist trekking industry.
It began, and still is an industry serving western fantasies. The myth was nonexistent in Thailand when Roger Patterson went over there for the bar girls of Bangkok, so he could not even name the place he was supposedly looking.
Patterson himself said the story was a hoax, and it was a doozie - a live bigfoot being held captive in a Buddhist monestary. He did not name the person who supposedly sent him the letter and he did not name the monastery nor even the region. With a story that sensational, it would have been easy to fact-check had he named the alleged story-teller or the monastery.
All over the world we see the same thing emerging: bigfoot is being injected into regions with bona-fide wildlife preservation programs for real animals but the wildlife managers themselves do not recognize its existence. Native cultures which are no longer viable because they are placed on reservations without the ability to pursue their previous livelihoods service tourists with whatever sells.