Two things:
1. From the latest Blight Patch notes - Additions
[*]Dragon Hoardables have started to appear in the loot tables for all the monsters.
2. Check this thread: http://community.istaria.com/Web/ShowPost.aspx?PostID=54461
Yes, the Royal Bell truly is worth 6400 HV. And yes, there are items in the new hoardable system that top 50,000 HV.
- Amon