The T'Pau was decommissioned in 2364, and was later sent to Surplus Depot Z15 at Qualor II, where it was registered on stardate 41334.2, and stationed at Section-18-Gamma-12. At that time, it was stripped of materials, armaments and sensors, its navigational deflector array being routed to the holding vessel USS Tripoli.
In 2368, the array was found in debris from a Ferengi cargo shuttle. Upon investigation at Qualor II, it was discovered that the ship had been stolen from its resting place in the surplus depot by a Ferengi arms dealer named Omag, who transferred it to a Barolian freighter near Galorndon Core. The Barolians later transferred it to the Romulans, who in turn, refurbished the vessel and used as part of a "peace" envoy, a ploy used by the Romulans in their failed attempt to conquer Vulcan. The ship was later destroyed by a Romulan warbird to prevent the crew of the USS Enterprise-D from taking custody of it and the Romulan troops aboard. (TNG: "Unification I", "Unification II")