If the search still produces no results, the product may no longer listed.
#CISCO PART NUMBER LOOKUP TOOL SERIAL NUMBERS#
You need CCO access, if you can't get to the tool, post the serial numbers here as a text file. If the search is empty, you will see: "Your query returned no data." Please check your search criteria for errors and try again. the tool you are looking for is the Device Serial Checker (linked below).