Dear Nancy.
Yes, We already told you. Original B//L for China shipment could be released in Thailand only.
Refer email from DOW th on 26 Jul. If shipment which request Form-E OB/L should be released in Thailand. Understand that is Rule of origin for the ACFTA. And shipment which using not direct vessel and T/S at port. NON-ACFTA Parties.
Anyway we have 4 agent which they can release original at SGP. But they have a lot of process. If SGP side not release B/L they can't send copy to us. (In case of SGL agent). Which on my experience it using a lot of time more than Original Release at Thailand.
If you have any concern you may send email to IES TH again. For sure and updated information.
Hope is can clearly clarify for you.