In making this allegation former Ho Hup managing director, Low Tuck Choy said he got to know this after the MACC entered the company's premises last year.
Responding to last Friday's MACC's statement that they won't be calling Low to assist in the investigations while saying it would welcome his forwarding any further evidence in his possession, the former managing director of one of Malaysia's largest construction companies said this was proof enough that the commission was not serious about its probe.
"When the MACC went into Ho Hup, they asked our staff how come the documents were leaked.
"After 10 months, the MACC should have finished its probe into the case but it is still pending," he told Malaysiakini.
Low, 54, had in his police report earlier this month claimed that the documents which were uploaded in the Malaysia Today news portal are genuine.
The documents contain an invoice from an electrical company, Ho Hup's payment voucher dated 2009 with Abdul Gani's name following work on a Seremban bungalow.
We know who endorsed cheque
For example, Low added that the company knows who had signed the cheque and who prepared the cash voucher for the electrical work carried out on the bungalow said to be linked to Abdul Gani.
The person, Low said had since left Ho Hup but he is traceable and the company had also filed a suit against the person in connection with another case.
"Has the MACC checked the electrical company? The address is there. Have they gone to investigate? I should not be telling this as they (the MACC) are seasoned investigators," he said.
It was alleged that former Ho Hup deputy executive chairperson Vincent Lye, Low's rival, had sanctioned the payment of the sum from the company's coffers to finance the renovation.
In return, Abdul Gani (right) is alleged to have used his prosecutorial power to charge Low in a magistrate's court with four counts of failing to notify the changes in his interest in the company within seven days.
His wife was also being investigated.
Abdul Gani has, however, denied owning any bungalow or property in Seremban when posed the question.
Low also questioned why Deputy Minister in the Prime Minister's Department VK Liew's response in parliament was different from MACC's.
He asked if the MACC is giving different answers to the deputy minister or misleading the minister or Liew himself is misleading parliament.
Liew had fielded Puchong MP Gobind Singh's questions, saying that the MACC was still mulling over the possibility of investigating claims that Gani had accepted bribes from a construction firm.
Low, who is the son of Ho Hup founder the late Low Chee and the family still hold a substantial stake in the company, said the company has also filed several suits against Lye.
He added that after lodging the police reports last month, the commercial crime unit had recorded his statement.