Question 1112652
Volume of wood used = external volume - internal volume

External volume 
L*B*H   (6,5,8)

= 6*5*8= 240 in^3

Internal volume 
subtract2 from each outer dimensions ( one for each edge) with lid

4*3*6= 72 in^3

wood used = 240-72=168 in^3

internal volume =72 cu.in

72  cubes will fit