Product all of a sudden requires Transparency Codes

Had a product I’ve been selling for a few months and all of a sudden I’ve become restricted in it due to it now requiring Transparency codes which previously weren’t required. According to Amazons email they can hold my remaining inventory and possibly “dispose” of it due to it not having the Transparency Codes. What do you suggest I do to get the inventory back? My supplier doesnt have transparency codes for this item since they were purchased before the new requirement, and even if they did I would still needed the inventory back to label them.