As we checked your L/C which received from bank, it does not have details about HS code.
However, our product is sushi vacuum pack.
Please note that Commerce Ministry of Thailand uses HS code of vacuum pack on C/O Form AK 1605.29
For HS code is your request 1605.21, it is HS code for cooked item which not vacuum pack.
We look forward to corresponding with you.
Thank you so much.