When the Barge of the Dead reached Gre'Thor, only B'Elanna is seen getting out of the boat. There should be many other Klingons getting off the boat as well because there were no less than 10 other Klingon souls on the Barge.
Nelix claims that the "Klingon Artifact" found is from the Alpha Quadrant, when Qo'nos is found in the Beta Quadrant.
The artifact was found in the Delta Quadrant, but when B'Elanna discussed with Chakotay, she assumed that Borg might have assimilated some Bird of Prey in Alpha Quadrant. There are few possibilities that Klingons haven't had any contacts with the Borg in the Beta Quadrant like humans have had with them on the Wolf 359, or they are too proud to admit that. So claiming it happened in the Alpha Quadrant, it can be emphasized that a single Bird of Prey fought valiantly against the Borg cube or that the Bird of Prey was previously damaged by someone else. Thus based on B'Elanna's and Chakotay's discussion it can be assumed to be from the Alpha Quadrant. Also everything happened in B'Elanna's head so Neelix was just her imagination and thus would support her original assumption, that the artifact was link to the Alpha Quadrant.
The artifact was found in the Delta Quadrant, but when B'Elanna discussed with Chakotay, she assumed that Borg might have assimilated some Bird of Prey in Alpha Quadrant. There are few possibilities that Klingons haven't had any contacts with the Borg in the Beta Quadrant like humans have had with them on the Wolf 359, or they are too proud to admit that. So claiming it happened in the Alpha Quadrant, it can be emphasized that a single Bird of Prey fought valiantly against the Borg cube or that the Bird of Prey was previously damaged by someone else. Thus based on B'Elanna's and Chakotay's discussion it can be assumed to be from the Alpha Quadrant. Also everything happened in B'Elanna's head so Neelix was just her imagination and thus would support her original assumption, that the artifact was link to the Alpha Quadrant.