I don't know of any registry that is constantly searching for serial numbers where posted (auctions and dealers...sometimes), though it is an interesting question. In the case of Alpha Hands, if someone finds that a watch they are considering purchase is listed in the AH registry, such as
@abrod520 's pieces, they would be able to reach out directly (via the original lost post, if available, from which they can contact via DM or otherwise indicated in a post), or contact me (if the individual with the loss has separately provided contact information). I am not certain the process for other registries, however - my guess is that they maintain the individual's contact information and do not provide it to the finder, but rather contact them separately. I am not certain, however.
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