Archduke Maximilian Franz (1756–1801) was Archbishop-Elector of Cologne, Beethoven’s employer, and an admirer of Mozart (Briefe, iii:194). The Elector, the last child of Francis Stephen of Lorraine (Emperor Franz I) and Maria Theresia, had arrived in Vienna on 6 Nov 1791. On 28 Dec 1791, a few days after the Elector’s departure, Constanze wrote to Luigi Simonetti, a tenor in the Elector’s service, offering Die Zauberflöte and La Clemenza di Tito for 100 ducats each (Briefe, iv:177; on this offer, see also Edge 2001, 647–653, regarding a Viennese copy of Die Zauberflöte now in Modena that may derive from Max Franz’s collection).
Das Politische Sieb was initially a local supplement to the Auszug from 16 Nov to 31 Dec 1791 (on which see the document for 12 Jan 1788), and then had a short-lived existence as an independent publication in the first three months of 1792. This report correlates with a later one (30 Dec) in the Hungarian Ephemerides Politico-Litterariae (Dokumente, 379), and may have been the source for it.