Well, I'll say this.

If anyone got a picture or a good hard look at them, which is a challenge in its own right. And that person then dug around in the right places, it will link him to a certain person.

However, if you wanted an easier way to learn more about Shiro...

They could just research his weapons. He never actually forged his own weapons, he was discovered with them. He was told they were his parents. He has only since learned how to maintain and alter them but he never originally made them.