Different governments have different laws..................
Art. 723 Swiss Civil Code
4. Treasure trove
1 If an object of value is found in circumstances indicating with certainty that it has lain buried or hidden so long that it will not be possible to trace its owner, it is treated as treasure trove.
2 Subject to the provisions governing objects of scientific value, treasure trove belongs to the owner of the land or chattel where it was found.
3 The finder is entitled to an appropriate finder’s reward not exceeding one-half of the treasure’s value.
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Art. 724 Swiss Civil Code
5. Objects of scientific value
1 Ownerless natural specimens and antiquities of scientific value are the property of the canton on whose territory they are found.
1bis Such objects must not be alienated without the consent of the competent cantonal authorities. They may not be purchased in good faith or acquired through adverse possession. There is no time limit on the canton’s right to recover them.
2 The owner of the land on which such objects are found is obliged to permit their excavation in exchange for compensation for the damage caused.
3 The finder, and in the case of treasure trove also the owner is entitled to an appropriate finder’s reward not exceeding one-half of the value of the find.