Serial Number Verification Tool

Hello, I am searching for a tool to verify existing serial numbers in Smithsonian's ERP financial system. We are preparing for our end of year audit and have been given several (40+) requests to update serial number information for various Apple products (MacBooks, IPads, etc.) and I want to validate what was collected during a physical inventory through Apple as we do all Laptops purchased from Dell. In particular, there seems to be a leading "S" character on some but not on all of the serial numbers reported that I can only assume was on the "packing slip" when received, but not on the physical asset itself. Thank you in advance for your time and assitance.