They hid it where?

Sydney, Australia (AP)
   Australian police seized $246 million (American money) worth of cocaine and meth hidden in a steamroller shipped from China.  Ok, who decides to hide dope in a steamroller?  And more importantly, what supervisor says, "ok boys, we will be checking all steamrollers today."  So many questions, so little time.  By the way, the sentence for being convicted of smuggling drugs into Australia is life.
Protect your equip-ment,
Rodger  ;-)