Actually we have had the case when a cat is advertised and owner found but they didnt leave a donation! If we treat a cat and the owner if found a few weeks later we have give them the bill. We only treat suspected owned cats if they are poorly, this one was. It was also full tom.. and cost us an arm and leg in vets bills, we got him neutered and then found the owner 2 days after the 14 days were up (it was a weekend).. We then sent them the bill. we actualy had a cat that had still had scar marks from being spayed, but despite ringing all vets and rescues we didnt find an owner...
Actually we dont have a great success with found cats, you would think that people would contact vets wouldnt you, but they dont?