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Actually here is a much better example. I would say player's shoudl keep quiet about this forever or at least until they leave the table. Final board reads AAA78 player A bets player B thinks and then folds. A player that folded an ace preflop should keep that info to himself; it isn't really right to tell the table this guy didn't have 4 aces.

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If you were the floor and called over after this occurred ... would you warn the player? What happens the next hand when the board is AK785 and after the hand someone pipes up that they folded 69 do they get warned? Ejected? or does it only apply to the case card being announced.

One thing about situations like this that when a player says they folded what would have been the winner pre-flop I don't always believe them. I have heard other players claim to have folded a card that I held in my hand.