I noticed Asia is severely underrepresented. This is normal in western collections, but there are exceptions. You should find great examples from China, India, Indonesia, Iran (actually Muslim countries in general), Japan, and Vietnam. Some potential leads on works you haven't catalogued: (1) The collection search site for the Dutch 'Wereldmuseum' in Rotterdam, which houses the state collection (they were the first to Japan). (2) The same for Lisbon's Museu do Oriente. (3) International Dunhuang Project, affiliated with the British Library, which has scanned some of the earliest printed works in Asia with a good digital catalogue, some of which have graphic elements. (4) Musee Guimet, Paris. (5) The Print and Graphic Communication Museum in Lyon. (6) The National Technical Museum in Prague (great printing and photography holdings). (7) Asian art auction records. (8) Should you broaden to sculpture, many of the great Buddhist and Hindu carved stone monuments incorporate text with their form elements, though generally not integrally. (9) Chinese folk arts of paper-cut, embroidery (upholstery/cloth/fashion) and new year folk printed door poster art probably have some exceptional examples, as will some cast bronze sculptures such as temple incense burners.