Eternal Bond Annulment

Approximately six months ago, some events transpired which led to a real life person using my account whilst I was away from the keyboard to discard or otherwise remove from my inventory my Eternity Ring.

I'd presumed that, as you cannot discard it using the game's discard functions, the Bond was annulled, and the ring destroyed in that manner.
Today I tried to become Bound to another person, to be told that I needed to annul my current Bond beforehand. Confused, I spoke to the Acolyte to do so, and got an error about there being no Eternity Ring in my inventory.

I've searched my retainers' inventories, my retainers' equipment, my inventory, my armoury chest, and my key items, and can not find my ring.

How do I go about either finding this lost item, or annulling a previous Bond without it?
Thanks for any help.