In the Pittsburgh Post-Gazzette, Alan Petrucelli has written a piece on St. Anthony's Chapel in Troy Hill. They have the largest reliquary outside the Vatican and it includes a fragment of the Last Supper table. The inscription reads "Ex Sacra Tabula Ultimae Coenae, D.N.J. Christi" (From the sacred table of the Last Supper of Our Lord Jesus Christ).
Check out the article.