Engines M.I.A, something to ponder.

When I was a teenager I had a cox 049 free flight helicopter made during the Estes era, on the day of the maiden flight my mom, dad, brother and I went to an open field for the maiden flight. If I recall correctly I was able to get one successful flight before I sent it on its second and final flight. On the second flight, once power was cut, the helicopter coasted down gently into a swampy area to never be seen again. Fast forward 10 years and I have been wondering if the helicopter is still there? Possibly unless they have developed the land since I left Colorado.
But it has me wondering, we’ve had model airplanes as free flight, then control line and rc, the hobby has existed for around 100 years ago, with millions of models created and milllions of engines to power these craft. I know that I am not the only person to have lost a model in this way and there are countless others that have all suffered the same fate.
My question, of all the models that have been sacrificed to the ghosts of the Bermuda Triangle, how many engines are out there? Out their, cold and buried in the mud, in some nameless field, Forrest, swamp etc. the airplanes that the engine was once attached to is most likely not there anymore but the engine likely exists and is out there buried like a coin, or other artifacts
Don’t think to deeply on it, it’s not worth loosing sleep over, just something kind of fun to toy around with in your head when you’ve got a spare moment to ponder.