Let the length of the gift box be a, the width be b and the height be c.

2b+2c=235-5=230

2a+2c=445-5=440，2a-2b=2 10

2a+2b=5 15-5=5 10

4a=720，a= 180，b=75，c=40

The volume of the gift box = 180*75*40=540000 cubic centimeters.