What can I do if I lost the serial number?

What can I do if I lost the serial number to logic? I have the Box from SAE studing audio engineering. Got the same laptop that came with product but I Upgraded and wiped out and refreshed my Mac OSX software. Want to reinstall logic but can't find the serial number no-where in the box Please help. If So email me at Davidvics@rocketmail.com or reply to this message please.