A cube will house each spherical ball.
The cube that houses a spherical ball will have side lengths equal to the diameter of the sphere.
We will need to find the surface area of the cube that houses the volleyball. The surface area of a cube is found by the formula:

Where
a is the side length of the cube
First VolleyBall
Diameter = 8 inches
So, Cube Side Length = 8
Surface Area of Cube:

So, Amount of Material Needed = 384 sq. in.
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Second VolleyBall
Diameter = 9 inches
So, Cube Side Length = 9
Surface Area of Cube:

So, Amount of Material Needed = 486 sq. in.
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Third VolleyBall
Diameter = 10 inches
So, Cube Side Length = 10
Surface Area of Cube:

So, Amount of Material Needed = 600 sq. in.
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Thus, the total amount of material needed to make 3 boxes for the volleyballs is
384 + 486 + 600 = 1470 square inches.