What are the chances that someone has actually generated an address already in use by someone else?

I get that the odds of two people generating the same Bitcoin private key are astronomically low (like, 1 in 2¹⁶⁰⁾ but with millions of users, years of activity, and tools that generate keys at crazy speeds, I wonder:

Could it already have happened without anyone knowing?

Maybe someone generated a private key that matched an active address, but the wallet was empty so they never noticed. Or maybe someone did find one with coins and just kept quiet.

Not asking if it’s likely, I’m asking if it’s possible in practice that it’s already happened, even once.

What do you think?