Who is responsible for declaring lost property found inside an animal?

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If the fisherman finds lost property (like coins or modified pearls), he must announce it because he is the one who discovered it within the caught item. If the buyer finds it, the buyer is responsible for the announcement because he is the finder. There is no need to start with the seller in the case of a fish caught from the sea, as it is unlikely the fish swallowed the item after the fisherman acquired ownership, meaning the finder and the seller are on equal footing regarding discovery.