Why have the Adamantite Boxes not been added to the Regular Shop despite Main Quest 19-8 being cleared?

After fulfilling the requirements of reaching a Party Lv of 300 and clearing Main Quest 19-8, new products will be added to the Regular Shop when it refreshes.

The Regular Shop can be refreshed via the two methods below:

• The Regular Shop will automatically refresh every day at 9:00, 12:00, 15:00, and 18:00 (Server Time)
• The Regular Shop can be manually refreshed by spending Diamonds

*If you have fulfilled the requirements to have Adamantite Boxes added to the Regular Shop before the start of maintenance, they will be added to the Regular Shop product line-up when maintenance has been completed.