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Further back there was also the infamous incident of BAR using a second fuel tank as ballast (Approx 15L of fuel) to save weight in San Marino (2005 when Button was 3rd and Sato was 5th)Let's not forget this isn't the first time a car has been DQ'ed as a result of post-race scrutineering.
Vettel lost 2nd place in the 2021 Hungarian GP because he didn't have enough fuel left in the car. Cars are required to provide a sample of at least 1.0 L for scrutineering (presumably to verify that the fuel hasn't been doctored). Vettel's car only had 0.3 L left in the tank, so he was DQ'ed.
Hamilton & LeClerc were both DQ'ed from the 2023 USA GP, after they were ruled to have excessive wear on a wooden plank underneath the car.
Apparently it was somewhere close to 5kg underweight once all the fuel was drained (Enormous in the days of refueling)
Eventually the FIA got their way and both cars were disqualified and the team was lucky to get away with a 2-race ban