S. 153A: Assessment-Search-Unexplained investments-Indian nationals and residents had foreign bank accounts in HSBC Bank (Suisse) SA Geneva which were not disclosed to Indian tax authorities-Peak addition-The base note on which revenue sought to place reliance was in fact a document available post-search and admittedly was not a document recovered under search action, and moreover, assessment proceedings had also stood completed, hence, base note being a document available post-search could not be considered to be any incriminating document to assess or re-assess assessee’s income. [S. 69, 132, 147, 148, 260A]