I haven't seemed to notice any being posted or maybe zi don't notice them being a beast weapon.
I thought about it because one of the wolf beasts dropped a rare item during closed beta and I didn't look at what it was. It was near the end and after I got out of the zone I was looking through my list for some kind of special weapon but didn't see one. So it might have just been a rare item I didn't know about or thought was rare.