I'm uncertain. If it goes into your Grave you should be able to die and obtain a second, similar to a method of obtaining duplicates pieces of Ibis.
You can put Black Ibis in your house and get another set like I did this weekend. Took me just under 4 hours with the Sceptre of the Gods. Unsure if you can get a 2nd one if you put your first in keepsake though, as I've had Black Ibis keepsaked before I had the full set and only received the pieces I didn't have (could be luck or could be set like that).
But yeah, dying and getting someone to bless ya grave is the other way to do it.