$1000 is not small. Not sure what you are trying to prove, but you are wrong. You also can't transfer more than 50k baht into Thailand. There are only 3 banks that allow this.
Also directly on NFCU website it states that any amount sent for $5,000 or more to a third party aka a bank account can only be done in person. This is of no use to ppl not located in the US
If you ignore it you are looking at a 5000 baht fine, plus 200 baht a day from the due date until you file it. So if you never do it, you could be looking at a 60k baht fine