Help with USPS International from US to Australia?

Same here. I am facing the exact problem. I order something from Ebay on 25 May. and there website says that they tried to deliver on 2 june which is bullshite because i was at home entire day. and still waiting for it. i've gone to auspost as well and they don't know anything. so if find out let me know as well please!. (really third class service from USPS)