 Just how "underground" the practitioners that produced these texts were therefore remains contested, though Betz points to the admonitions to secrecy about the details of certain practices in certain of the papyri.The first papyri in the series appeared on the art market in Egypt in the early 19th century.Another papyrus (PGM III) was acquired by the diplomat Jean-François Mimaut (1774 - 1837) and ended up in the French Bibliothèque Nationale.