The discussion clarifies that fingerprint and thumb impressions became mandatory for property sale deeds in India from 2001/2002 onwards, following an amendment to Section 32-A of the Registration Act, 1908. Prior to this amendment, such impressions were not required. The conversation addresses a specific query about a sale deed from 1979 lacking a fingerprint, and experts advise consulting a local lawyer for verifying the document's authenticity and pursuing legal recourse if fraud is suspected.