im not cashis but....i forgot about the triangle first...so to find area...base X height X width.
12*15*32=5760
then find out the triangle:
5*15*32=2400/2=1200
add those two numbers... 5760+1200= 6960 cubic inches.
convert that to cubic feet by 1728 (12*12*12). which is 4.03 cf.
oppps my bad on my first number.
anyway...the box is too big either way.