don't know, just accidentally stumbled upon that today, and got worried I might have missed someting. I did consult with the IO, and this 'source of the 800k' was not mentioned/not stated in their checklist.
bit hard to remember.Those months in early 2023, prior to keeping the thb 800k minimum, I sent funds from my USA-based bank to SCB, but with mixed purpose of both paying my installments here in Samui on a new villa being build, as well as keeping the minimum 800k. The bank book of SCB mostly just shows 'consolidated figures', so it is impossible to align fully with my USA bank statement on international transfers. Note: That time I used just one SCB account for that. BTW, in 2023 it was not a requirement that the 800k came from international transfer (only the 65k modality had that)
when visiting IO last week they did nor refer to requirement to show the 800k came from overseas, but maybe they might bring this up at the appointment and document submission of documents this week (31st). Problem is the 800k is at my SCB which does not indicate if a transfer was coming international (such as my Bangkok Bank does).