To see a list of all your serial numbers, go to your Account Data (Gear Icon) and click on Serial Numbers. Here you can check the Status of each serial number, whether it is Available, Shipped, or Returned to the Supplier. The list also shows the Last Document that this serial number was seen.
Another way to see the information related to a serial number is to type the serial number in the search box on the top right corner of your screen. Mouse over the serial number that appears in the search results and an additional box will appear. There you can see the serial number's status, product and inventory location. Additionally, you can see the names and the dates of all the documents that this serial number was seen.