The agency made the submissions while seeking extension of custodial interrogation of Sushen Mohan Gupta, who is under arrest in the case.
ED's special public prosecutors D P Singh and N K Matta told the court that the agency had found entries of over Rs 50 crore against "RG" in Gupta's diaries.
"The custodial interrogation of Gupta is required as he is misguiding the probe by deliberately giving wrong explanation of abbreviations in his diaries wherein abbreviation 'RG' finds mention in many pages as well as pen drive data.
"More than Rs 50 crore shown to have been received from 'RG' between 2004 to 2016, whereas the 'RG' identified by Gupta, i.e., Rajat Gupta, had admitted to have cash transactions wish Sushen from 2007 onward and the same are being quantified," the agency told the court.
The agency submitted that Sushen said he only knew one 'RG' who was Rajat Gupta, whereas Rajat denied the transactions which were made in the name of RG and said he not the person being referred to.
ED told the court that Sushen was not coming out with true and correct fact or identifying who is the real RG mentioned in the entries.