It was revealed in VOY: "The Voyager Conspiracy" that a Cardassian ship entered the Delta Quadrant at roughly the same time as Voyager, however it isn't said if it was this particular ship, although it most likely was.
Now, I honestly don't think we can take Seven's word for it that the ship was there. She was sort of gorked out, remember. Also, I don't think the ship she showed Chakotay was the same one. I'm'a delete it - again. --TribbleFurSuit 02:37, 23 November 2008 (UTC)