See:
http://www.ebay.fr/itm/Porte-cartes-du-General-MACDONALD-Fait-Marechal-d-Empire-en-1809-par-NAPOLEON-/261673516586?pt=FR_JG_Collections_Militaria_Uniformes&hash=item3cecf4fe2a
Of possible interest:
http://www.ebay.fr/sch/sis.html?_nkw=Porte%20cartes%20du%20General%20MACDONALD%20Fait%20Marechal%20d%20039%20Empire%20en%201809%20par%20NAPOLEON&_itemId=261492455514