Court papers revealed that a bag with a million dollars were concealed in the library of his country home in Zvimba.
Fears of the return of violent repression sparked crackdown of Zimbabwe forces.
During his later years in power, Mugabe made several medical trips to Singapore.
The election will see 75-year-old President Emmerson Mnangagwa, a long-time Mugabe ally, face 40-year-old Nelson Chamisa, a lawyer and pastor.
Samuel Undenge, an energy minister in Mugabe's cabinet, was accused of issuing a US$12,650 contract without due tender to a company that did no work.
Investigators from the parks and wildlife authority has handed documents to police showing that the former first lady “spirited large consignments of ivory to China, the United Arab Emirates and the United States among other destinations.”
Zimbabwe's ex-leader Robert Mugabe sent shockwaves through the party he dominated for decades when he posed with the retired general who will take on the ruling ZANU-PF in this year's election.
Mugabe terkenal dengan reputasi berbelanja besar di luar negara, termasuklah rawatan kesihatan tetap ke Singapura - salah satu punca kemarahan rakyat miskin Zimbabwe.
The former leader who was ousted in a military coup recently left Zimbabwe yesterday with his wife
His nephew, Patrick Zhuwao, had told Reuters that Mugabe and his wife were “ready to die for what is correct” rather than step down in order to legitimise what he described as a coup.
The deputy prime minister says the government has no objection to the Zimbabwean president coming to Malaysia to seek medical treatment.
Under house arrest in his compound, the 93-year-old has watched support from his party, security services and people evaporate in less than three days.