One possible solution to identification problems, especially when traveling to Venice/Murano, is to take good photographs of the items you think - or know - are Murano/Italian that you want ID'd or specifically named. Bring the photos along on your trip and look in shops for something similar or show them to some of the furnace sueprvisors. Also, you can certainly bring the photographs to the Glass Museum on Murano and show them to the staff or make comparisons within the exhibits.