3 years ago we came across a rusted out 65 chevy truck that sat on our small farm we have owned since 1994. Covered in a thick covering of multi flora rose.
Gas company running a gas line across backside of property found it after bulldozing scrub mf rose for a a right of way.
Never knew it was there.
One time my wife and I were flying back from a $100 hamburger run when we spotted a pickup truck that was a couple hundred feet below a logging road in a remote area in the coastal range of hills between Elma and Olympia, WA. It took half a dozen passes to confirm that it was not just an abondoned vehicle that had been pushed off the road.
The state patrol went and checked it out. It turned out that it had just happened the night before and the people miraculously were not seriously injured, but they must have had a pretty wild ride. This was at the edge of a clearcut area and the vehicle would likely have been covered with brush and black berries within a few months. But it still would have been easier to spot than a plane that went down in the middle of an unmolested forest far from any roads.