@Pierre *******
Immigration will want to see the 800k transfer listed in your bank book as an international transfer. You mentioned the funds have been there for years. Do you still have the bank book showing that 800k transfer? If not, you might want to stop into Jomtien IO and ask the man that works the Retirement desk what he would want to see from you, or what you should ask the bank for to confirm the 800k was an international transfer. The man that works the retirement desk has always been professional, polite, and helpful.