"conserve items..." 

Bull. Rat holing them away in their private collection is not "conservation" in the way that museums conserve artifacts. They date from around the fourth millennium, BC. Cuniform tablets such as these have very little if anything to do with the bible, except to cast doubts on it's originality. 

"George Smith was responsible for deciphering The Epic of Gilgamesh and in 1872 CE, famously, the Mesopotamian version of the Flood Story, which until then was thought to be original to the biblical Book of Genesis."

http://www.ancient.eu/cuneiform/



On top of it all, they knew they were illegally obtained, otherwise, there would have been no false labeling.