Where, when are the ballots cast and counted?
Results of secret ballots are reported to county and state GOP same night. Only in a few urban areas that are locked into Dems anyway could be faked.
I have been intimately involved in Iowa caucuses since the first (Dems in ‘72 for high school, and GOP since ‘76) either as a delegate or a rep for a candidate. Pat Buchanan in the ‘90s.