The investigation's terms of reference,released on Monday,show it will probe the roles of Ms Holgate,then-chairman John Stanhope and the board in thepurchase of the Cartier watches for four senior employees in 2018.
As part of this,it will examine whether Ms Holgate and the board acted within their obligations as chief executive and directors,and whether this was consistent with the"efficient,effective,economical and ethical expenditure of money and use of public resources".
The inquiry will also delve into Australia Post's"governance arrangements and management culture",and whether the giving of"gifts,rewards and expenses,including personal expenses of executives"meets public expectations and requires further review.
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The four-week investigation will be jointly led by the Communications and Finance departments in conjunction with a law firm,which has not yet been announced.
The luxury watches are the latest expenses scandal to plague her three-year tenure,following revelations she spent about $300,000 on corporate credit cards and chauffeur-driven cars in 2019-20. She also paid areputation management firm $119,000 for just 38 days' work for the organisation between June and July.
Former Australia Post chair David Mortimer,who served on the board for 11 years including six years as chair,said there was no culture of gift-giving when he was at the organisation.