Don't tell me, I'll guess. This is to prevent Muslim terrorists from smuggling in SA-7 anti-aircraft missiles, AKM's, RPD's, RPG-7's, and T-72 main battle tanks piece-by-piece into Australia? Sounds like a really sound plan to me.
The Postal Service must've been taking lessons from the Transportation Security Administration (TSA) here in the U.S. [For those who don't know, the TSA is composed of the same morons that passed the Muslim terrorists through security so they could hijack four airliners on 9/11/2001. The only difference is that on 9/11, they were contractors working for the airlines doing the security task. Now, they are unionized government employees that are paid more with the same deficient skill set. I really feel much safer since I quit flying.]