oh and quite sure there is no magic number and none of my clients ever had this problem nor did I when I applied. You could give them their tax ID to help them saving face, it´s TAX ID : 0-1055-
I am agent but probably too late to take over the case. A safe workaround would be to take out the money in cash and then bring it to Krung Thai Bank in 195 Empire Tower South Sathorn Rd., Yannawa, Sathorn,Bangkok
thank you very much for detailed and precise answer! Most likely I will risk to get fined. Rather spend 2k than a day at Chaeng Watthana. I rarely have to go there at all because I am on elite visa and usually traveling quite often. Thanks again, I appreciate your effort