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The volume of a rectangular box can be found by multiplying the length, width, and height of the box.
In this case, the length is 9.9 inches, the width is 5 inches, and the height is 2 inches.
Therefore, the volume of the box is 9.9 inches * 5 inches * 2 inches = <<9.9*5*2=99>>99 cubic inches.
The volume of the box is 99 cubic inches. Answer: \boxed{99}.