Floyd popped the question to Frei in her hometown of Boston on Saturday, Dec. 21
The Cowboys were eliminated from the playoffs earlier on Sunday.
The alleged misconduct reported by the whistleblower related to several employees who worked in the company's international e-commerce logistics parcels business, the company said in a statement, without giving further details. CEO Vincent Phang, the chief of the company's international business unit Li Yu, and Chief Financial Officer Vincent Yik had been dismissed after the company found they had been "negligent" in handling the case and misrepresented it before an audit committee, it added. Chair Simon Israel will oversee senior management of Singapore Post in the interim.