My wife has had this happen twice, and was paid both times. At Station Casinos. The tech pulled up the dealt cards through the machine, and looked at what the draw was. She only complained if it was for 500 or more.
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Stations no-mails after Gaming complaint
I suspect when a casino pays off a situation like that, it’s a huge customer service favor on the casino’s part. If a VP machine has 5 static cards underneath the 5 dealt cards just waiting to be drawn regardless of what exact time the DRAW button is pressed, it would be a huge security risk for the slot manufacturer. A cheater could reverse engineer the shuffling algorithm much more easily with a set of 10 static cards than with a continuous shuffler working on the draw cards at all times. Once you knew the algorithm and the first five cards, a cheater would have an excellent idea of the next unknown set of five cards and simply change strategy on the fly. (Example: I see a “6” on the deal with a pair of jacks, yet I hold the “6” because the algo’s say trip 6’s are right underneath the dealt cards.)
This is why I’d be surprised if machines aren’t continuous shufflers anymore, and any payoffs on the casino’s part are simply an act of merciful customer service.