Kautilya's Arthashastra 14.3.85

14.3.85

kṛṣṇacaturdaśyāṃ puṣyayoginyāṃ śuno lagnakasya yonau kālāyasīṃ mudrikāṃ preṣayet //
tāṃ svayaṃ patitāṃ gṛhṇīyāt //

On the fourteenth day of the dark half of the month combined with the star of Pushya, one should thrust into the organ of procreation of a dog or heat an iron seal (kataláyasam mudrikam) and take it up when it falls down of itself. When, with this seal in hand, a collection of fruits is called out, it will come of itself (before the magician).