'Abu Sayyaf Stash' Plaques

I thought I'd try and manipulate the images of the plaques from video of the Abu Sayyaf stash. The results are not brilliant:

I was first inclined to see these as terracotta plaques of the 'Old Babylonian' type found in sites in southern Iraq (Larsa, Isin etc) in which case the regular edges were suspicious. On looking at them closely, I wonder if they are not stone inlays of some kind. We will have to wait for a proper report from the Baghdad Museum.