The Prime Minister's Office began to examine Mr Raja's latest letter on December 31, 2007.
The prime minister's principal secretary, TKA Nair, marked on the file that the "prime minister wants it informally shared with the department" and "does not want a formal communications and wants the prime minister's office to be at arm's length".
The observation came up for some seething criticism three years later.
Dr Singh's detractors said that he had done an ostrich and washed his hands off the matter totally.
Image: Manmohan Singh (R) gestures while talking with Planning Commission Deputy Chairman Montek Singh Ahluwalia during a meeting in New Delhi June 6, 2012.