Kautilya's Arthashastra 4.1.55

4.1.55

svakaraṇābhāve pañcaśato daṇḍaḥ, pracchannādāne sahasram //

Such treasure troves as a man of pure and honest life can prove to be his ancestral property shall wholly be taken by the man himself. Taking possession of a treasure trove without establishing such claim shall be punished with a fine of 500 panas. Taking possession of the same in secret shall be punished with a fine of 1,000 panas.