Taken from Meraki license FAQ
https://documentation.meraki.com/General_Administration/Licensing/Meraki_Licensing_FAQs
Can I purchase a new license for a used piece of hardware purchased on the secondary market?
Before purchasing any piece of Cisco Meraki hardware on a secondary market such as eBay, you are advised to contact Cisco Meraki Support to confirm that the hardware has not been reported stolen from a Cisco Meraki trial program or a bonafide purchaser. Please have the serial number of each piece of hardware available when you contact Cisco Meraki Support. Cisco Meraki will not support or sell licenses for hardware units that have been reported stolen.
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.