dak's Emu Mob: As promised, this cache is now archived. For those interested in knowing how it was solved, here are the details.
At the advertised coordinates, there is a large, green mailbox. There was a film canister hidden in it that held a note that said: This is not a Partic cache. Look harder! This was obviously a decoy. There was a power pole next to the mailbox with a metallic cover over the cables going up it. There was a magnetic key holder on the inside of the metallic cover. There was a key inside, with a tag that said: DAK = 874 and EMU = 366. The key opened a private post box attached to the wall of the pharmacy at the corner of Gardenvale Rd and Nepean Hwy (S 37° 53.874, E 145° 00.366). The number of the post box was 42: the meaning of life, the universe, and everything. [:D]
Interestingly, when I dismantled the cache, the green mailbox had been replaced with a brand new one, and the decoy cache had been removed. In addition, the key holder was still in place, but there was no key in it. [:O] I suspect that someone had slid the lid off accidentally in an attempt to retrieve the key holder, and the key fell into the abyss of the power pole cover. It's disappointing that they didn't contact me about it so I could fix it. Oh well!
Thanks to all the people who visited the cache. I hope you all enjoyed it. And to the person who lost the key, but didn't own up to it: Pppptttt!