I don't think we can find their wallet. If everyone knows whale wallet then we can know when they will sell their coin. Just 1 transaction deposit to exchange then the whole market will go down.
It wouldn't make any difference if we know the wallet they have because when we see the transaction, it will be too late for everyone to react when the whales dump their coins. Plus, it really is none of our business where they store their coins because of common sense and respect for privacy.