Papyrus Oxyrhynchus 187. P.Oxy.187, a circa AD 150 business letter of Irene.
Missing from Department of Classical Studies, University of Melbourne, Parkville, Australia since 1975
If you find the papyrus, please contact Dorothy.
I imagine the item has been removed through inadvertence, rather than by fraud, but it does highlight how museums are not the permanent repositories that we might think them to be.