[Keith nodded. The idea that he did actually have a blood family he could try to connect to had him really invested in this. He hadn't had something like that in a long time, though his relationship with his dad hadn't exactly been close later on. He regretted that a little now.]
From what Ulaz said, and from what I've seen from others, it looks like each one's unique. That might be how we can identify it and link it back to who it originally belonged to.
[He didn't clearly remember every single one from the Trials, but he did remember Ulaz's, as he had asked to see it specifically, and Thace's had been different, too.]