I have ownership of a Grinbones that was never recorded.
I posted the trade notice here but nothing was ever resolved.
After looking into it myself a bit, I found this post made by Talcen, before he gave me the Grinbones.
I am assuming my ownership was never recorded, because he was never recorded as the official owner, either, from that Christmas event that got all sorts of things a little messed up. Outside of knowing that, however, I do not believe any more details can be found.
[Fixed]