Spend enough time hiking in the woods, especially wooded areas close to urban centers, and you will find stoves, refirgerators, cars, and other large items -- not on the perimeter, but WAY back in there in the middle of the thick stuff. I too often wonder how they got the items back in there. And some of the items have been there for a while -- when a small tree has grown through the hole in the floorboard and is sticking out of the sunroof, that didn't happen overnight!
I just wished if people are going to hide caches next to a junk pile they would tell about it in there listing. I do not like to take my 4 year old son digging in trash!!!