I have already reached out to them!

Good luck! You've probably also already reached out to the Fitzwilliam in Cambridge, their online database seems patchy in listing acquisition data but here's one listed as "bought" data.fitzmuseum.cam.ac.uk/id/object/86...

Inscribed tablet: ANE.87.1904

A record for a Fitzwilliam Museum object: Inscribed tablet ANE.87.1904