Warner has previously apologised and accepted responsibility for his part in the scandal.
A unanimous decision from the Cricket Australia board means the bans for Steve Smith, David Warner and Cameron Bancroft will remain.
Bancroft’s ban is due to end on December 28, and Warner’s and Smith’s three months later.
Sunday's first ODI in Perth pits Aaron Finch's Australia against du Plessis' South Africa, and the focus for both captains is on winning.
While thankful for the support offered by CA, the former Australia coach said "but you could always have more, can't you?"
In a 145-page report by the Ethics Centre, CA has been accused of not consistently living up to its “values and principles”.
CA has accepted its portion of the blame and indicated its wish to improve the game of cricket in Australia.
The outgoing CA chief has said that he could have mitigated the Cape Town fall-out had he intervened earlier.
The deal will see Bancroft play all three formats as the English county side’s overseas player, but not until his ban runs to it conclusion in late December.
Richardson said he found it a "little disingenuous" for players to say that rules were unclear about how the condition of the ball could be altered legally.