Bah, thanks Kakero.
I discovered I was guilty of being rather greedy myself by selling instead of donating the items.
Luckily I had an autosave from just before I fought Kerrod, so I just repeeated a couple of encounters and donated the Dagger of Symmachus and the Mace of Slurring for the desired object.
So yes, only having to donate two pieces isn't that much after all! [img]smile.gif[/img]
Still, it remains a mystery as to why certain objects listed in the book aren't accepted.