I have heard the one about the engine in near San Jose. Of course what I heard was that it was junk used to plug up one end of a tunnel near Wrights Station during WWII to keep the Japanese from using the tunnel in any invasion plans. In fact I have heard the same story from atleast 8 other people, told exactly the same way and 3 of them were from the East Coast.
I hadn't heard the one about the ones in Baja, I don't do much research south of the border. Of course, all of the ones I mentioned in my other message were true.