The gun was found Wednesday in a house in the western suburbs, The Sydney Morning Herald reported.
A 27-year-old man was arrested on charges that included possession of the Glock, but investigators said there is no evidence he was involved in the shooting seven years ago.
The officer was wounded and has completely recovered. Police made an arrest in the shooting but never found the weapon that was used.
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UPI Almanac for Sunday, Sept. 21, 2014