Star Wars: Silent Destiny
Barrett Jax is, or was, the Core Worlds thief who originally gave the Eye of Oblivion to Nalin Nerr, to give to Yu Lien. Bella Nox has yet to discover his whereabouts, but the interrogation record of a different criminal placed Jax on Bothawui, bound for the Expansion Region.
Jax may know what the Eye of Oblivion is, who wants it, and why. He may also know where the decryption key is. If he was the one who stole it originally, he may also know where it came from in the first place.