I had asked a number of people whether seasoning was required on the 800K baht when applying for a non-o. I can confirm that at Phuket Immigration at least NO seasoning is required. Just the bank letter and 6 month transaction record. I had gotten my balance up above the threshold just last week. My visa exempt extension expires 23 February and I was told to come in 24 February to pick up the non-o. Can’t leave the country until then of course.