I’ve lost my garmin before. Maybe someone found it but they wouldn’t know how to return it because my contact info isn’t in the Garmin. Here’s an excellent tip from Ray at DC Rainmaker on how to add your contact information to any Garmin Edge 510, 520, 800, 810 and 1000. No good for Garmin Edge 500 owners which includes me.
https://www.dcrainmaker.com/2013/08/display-number-garmin.html