Australia wasn't allowed to have any old F117s.
https://www.urbanghostsmedia.com/2013/01/top-secret-aircraft-classified-stealth-...Top Secret Tombs: The Classified Stealth Aircraft Burial Grounds of Area 51In Abandoned, Military, Transportation / By Tom / 3 January 2013
Four pre-production YF-117s are displayed at museums across the United States. A fifth was scrapped at Palmdale in April 2008 to test effective methods of destroying F-117 airframes. Meanwhile, rumours persist that the mothballed fleet is in the process of being dismantled and buried at Tonopah, miles from public land. According to AviationIntel.com: “Some have even said the jets will get their own headstones with their unique names inscribed on them for posterity sake, although USAF officials have never corroborated such a claim.” If true, it marks a strangely eerie departure from the traditional aircraft graveyard, though underscoring an ongoing respect for the deactivated F-117s.
Unmarked Aircraft Graves at Groom Lake.
The Nighthawks may be the latest airframes to be entombed in the desert, but the practice is hardly new. More than 12 aircraft wrecks are known to have been buried in unmarked graves at Groom Lake since the 1950s. These include four U-2 spy planes, several A-12s (predecessors of the SR-71 Blackbird), an F-101 chase plane (crashed 1965), a Russian-built MiG-23 that had come into U.S. possession (crashed 1984) and two Lockheed Have Blue proof-of-concept aircraft that crashed near Area 51 while demonstrating technology for the F-117 in the late 1970s.
When they crashed, these aircraft were still highly classified. Lockheed engineers have since searched fruitlessly for one of the Have Blue aircraft (above), which was said to be relatively intact. But the search was terminated when diggers allegedly began unearthing other classified projects. The Have Blue’s final resting place, thought to be south of the main hangar complex, has now reportedly been paved over.
near-have-blue-resting-place (Image: Google Earth; Have Blue burial site rumoured to be in above vicinity)