Where do you live? That matters, unless you’re just asking from an ethics perspective. I’m not asking you to dox yourself, country/state is plenty.
Assuming you’re Canadian(based off your instance being lemmy.ca) technically speaking you should report in to the police, and they’ll hold it for 6 months. After that if someone hasn’t claimed it you’re free to claim it yourself. At least in Vancouver. Maybe the laws are different in other parts of Canada. Your local police probably have a non-emergency number for pretty much exactly this purpose if you wanna double check.
Realistically, it’s not even $200. Probably keep it for a week or two and then tell the kid the cops couldn’t find the original owner.
This is a funny mental image.
“Breaking news: Man gets normal sized plate at buffet. More at 11.”
Front of a newspaper in giant bold font:
“MAN TAKES NORMAL ROUTE HOME FROM WORK”