Is it possible that Xykon's Phylactery cannot be found by anyone but Xykon now? Like Ravenwing, maybe no one but someone spiritually or telepathically linked with the object can see it anymore. Or whatever relationship V had with Ravenwing.
This would mean those hobgoblins searching couldn't find it which would probably lead to Xykon spending time to find it?
That might just be true. But maybe you are putting too much thought into it? After all, Blackwing is a living creature.
When people told you that you were dumb, they were being nice.