The Pashupati Seal was recovered from Mohenjo-Daro, Indus Valley (now in Pakistan) and thought to date to around 2000 BCE, It shows a seated Master-of-Animals figure, surrounded by 4 opposing animals, which is consistent with Gurshtein's theory.
Those seeking 'evidence' that the Indo-Aryans were native sons of Bharat Mata, and not immigrants from western Eurasia, just can’t stay away from the unicorn.