Yeah, they are collected here. People build big 3 or 4 storey "houses" with no windows, just a few portholes and play recordings of the birds all day (to attract more). I imagine there are floors and maybe lots of walls inside. A few companies make big money buying from the farmers and on-selling.
I'm in Hatyai.
I will try to get the wife to photograph some as she is the photographer... I'm just a point and shoot guy.