When magician Dean Holiday is on stage being approached by detectives Goren and Eames, he has just finished his magic trick and still had his hands on the wheel. From behind you see he drop his hands down beside his body. In the very next shot, they are filming in front and his hands are still on the wheel initially until he puts his hands down beside himself.
The "Blade Box" trick, where Carmine inserts the swords through the cabinet, depends on the assistant's ability to rotate the cabinet's false back which puts her out of harm's way. As Goren explained, the trick is sometimes arranged such that the swords are inserted through a mummy prop rather than an empty box.
Either way, Carmine's assistant "Miranda" helps to wheel in the cabinet from backstage before climbing into it herself. She would have noticed Miles Stone's dead body hanging off the back of the cabinet, rather than a mummy prop. Even if Miranda had not noticed, the hands of another assistant was seen helping her with the cabinet setup from backstage making it nonsensical that two people missed a dead body.
Either way, Carmine's assistant "Miranda" helps to wheel in the cabinet from backstage before climbing into it herself. She would have noticed Miles Stone's dead body hanging off the back of the cabinet, rather than a mummy prop. Even if Miranda had not noticed, the hands of another assistant was seen helping her with the cabinet setup from backstage making it nonsensical that two people missed a dead body.
Even if Carmine was under the impression that the cabinet contained a mummy prop, he had penetrated the blades of at least five swords into Miles Stone's body. It would be impossible that anyone, especially a seasoned magician such as Carmine, could not differentiate the effort needed to insert a sword into a prop compared to a human body.