Hello @alaminr01
Unfortunately, it is not possible to get the Serial number from the MAC address. Instead, just claim the Meraki Order# in the Organization -> Inventory page when none of the devices/licenses from the order are claimed individually. This would claim all the devices in the Inventory page. You should be able to see the MAC Address and Serial number columns for the devices.
Let me know if you have any questions.
Regards,
Meraki Team