If it doesn't match your TIN or pink ID, then it's probably the bank's TIN.
It should appear on any bank withholding statement you receive. For BKK Bank, it printed in the upper block, top right.
Don't know about other documents. I checked a BKK Bank mutual fund confirmation/tax invoice without their TIN.
Google it! I put that number in the search bar and got BKK Bank's general information page.
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