I am having an issue opening the following coffers received after completing LV60 Class quests for Bard and Paladin:

Aoidis' Attire Coffer
Creed Armor Coffer

I am the proper classes and levels and have plenty of room in my inventory. The message I receive when trying to open them is as follows:

Unable to use the aoidos' attire coffer. You cannot carry more than one unique item of the same type.

Unable to use the creed armor coffer. You cannot carry more than one unique item of the same type.

I do not have any pieces of any of these coffers in any of my inventories. Has anyone had this problem?