The new findings come amid a probe into Samsung’s funding worth 20.4 billion won to Mir and K-Sports foundations, controlled by Choi.
Choi is accused of pressuring Samsung and other seven conglomerates, including Hyundai Motor, LG, SK and Lotte, to make donations to the foundations to promote Korean culture and sports.
Samsung admitted that the funding was offered for the public purpose of the foundations, denying that any business favors had been promised in return.
Prosecutors are investigating whether Samsung gave the money in hopes of receiving favors before the controversial merger of two affiliates -- Samsung C&T and Cheil Industries -- in July last year.
Utilizing her close ties with President Park, Choi allegedly forced the National Pension Service, one of the largest shareholders of Samsung C&T, to vote for the merger at a shareholders meeting.
Some Samsung C&T shareholders, including US hedge fund Elliott Management, opposed the merger plan, citing an unfavorable stock swap ratio.
By Kim Young-won (firstname.lastname@example.org)