Considering the facts that the Star Leage dismantled the Toro factory in 2598 and actively went about destroying surviving Toros and production sites, so I don't the few survivors of the Reunification War survived very long.
I think the only ones that would have remained until the fall of the Star League would have been in the hands of the Capellans, Davions, Pirates, private collectors/museums, or hidden away like Black Bessie. I also think most of those wouldn't have lasted long. They would have already been salvaged at least once to get where they are. The House, especially Davion, probably would have destroyed them and been properly compensated by the SLDF. Those used by pirates wouldn't have lasted long and the rest would have been scavenged for parts during the succession wars.