This actually happened. When we were living in Tokyo my wife lost her wallet. A day later she found that it was sitting in the basket of her bicycle outside our building. This was a busy street in a business district (Nihonbashi) with hundreds of people going past it and it was a large new coach wallet with at least a few hundred in cash.
Not that someone wouldn't have eventually stolen it though.
Not that someone wouldn't have eventually stolen it though.