Police are assessing the case.
Trainers Natalie Rasmussen and Mark Purdon are taking a sabbatical.
Christchurch organisers capped ticket numbers to 12,000.
But they'll need to get past a certain red-hot favourite to prevail at Addington on Tuesday.
His winnings were the most paid out by the TAB for the race in recent memory.
Kerrin McEvoy rode Tiger Moth to second spot at Flemington.
Anthony Van Dyck has become the seventh horse in the past eight years to die on Melbourne Cup Day.
Outsider Twilight Payment claimed line honours at Flemington in the race that stops two nations.
Winner Twilight Payment led from start to finish to take out the 2020 Melbourne Cup at Flemington.