I wonder how old those pics are?
I've seen an Israreli bone yard for aircraft and once they become truly unserviceable, they're quickly put on the surplus market.
A US P51D, even in that condition would bring around a million US$. Flying condition close to US$10 million.
There are lots of people with deep pockets actively searching for them and willing to go to rediculous extremes to find the hulks, especially if they still have the original registry plates.
With a bit of due diligence, that pic is from the eighties. P51s were some of the last WWII era fighters pulled out of service and often you could find them at different air bases and even the bone yards of civilian airports, which were shared with militaries in some countries.
The first time I flew into the "old" airport in Rio DeJaneiro, there were derelict WWII planes in a huge field beside the airport. Most of them were Dakota C47s, but it was amazing what was in the mix.
Varig airlines was still using Dakotas at the time and the bone yard was one of their sources for parts.