Bone takes forever and can get stolen by various vermin which can lead to people investigating.
You're best bet it to take the frozen part(s) and give them to pigs to eat once they've defrosted.
Bit at a time, but you could be done within two weeks without anyone suspecting anything
Call me ∑

That would depend on the size of the chunks and the size of the victim.
If you can’t say something nice, say something clever but devastating.