I agree, if we are talking about judged shows, there should be disclosure. And the item should be judged accordingly.
However, I believe if we are talking about sharing quilts on a personal level, for instance posts here on QB, we are getting awful close to "quilt police" territory if we try and dictate what information should be disclosed. Sometimes, it is nice to know. But, if it is omitted, it isn't for any one of us to stand in judgement.