Thai Customs has announced that effective November 13, 2017, it will strictly enforce the “marks and numbers” provisions of Custom Act B.E. 2560 (2017), Section 59.  This rule requires all commercial and transportation documentation, and all packages containing goods to bear "marks and numbers, and such marks and numbers shall be shown on all documents related to such goods.”  Penalties for non-compliance may be levied to a maximum amount of THB 50,000 (approximately USD 1,500.00) and will be charged to importers or exporters in Thailand for any violation.   

Exporters who ship to Thailand should ensure that their cargo is appropriately marked, and that the documentation (shipper’s instructions, packing lists, invoices, etc.) contains marks and numbers matching what is applied to the physical cargo so that the information may be transferred to the transportation documents.

The regulation in Thai can be found at the link below:

http://www.customs.go.th/list_strc_download.php?lang=th&ini_menu=menu_interest_and_law_160421_04&ini_content=general_interest_160426_05_160810_01&show_search=1&order_by=co_priority&sort_type=1&&xleft_menu=menu_interest_and_law_160421_04_160810_01&&left_menu=menu_interest_and_law_160421_04

An English translation of the regulation can be found here