I know a couple who have tested positive with no symptoms and then gone on to get ill. But none actually asymptotically. I think it was massively exaggerated to get people to comply with the lockdowns so the ‘but I don’t have the virus’ types didn’t go spreading it.
A 30 year old last month. He tested for a holiday and isolated without any symptoms.
My niece in California and my mates 17 year old daughter.