It does happen but it seems to "happen" at a frequent amount here on this website alone with yanmars which are an obscure tractor... especially on a model that was never sold new here in the US? It was most likely sold new in Japan, used over there for a decade or two then imported here to be bought by some guy to leave it out under the tree to only clear the snow on his farm located in mid Louisiana ? These are more obscure models (not sold here in the US to begin with so rarer here), it's not like it's a Chevy car or truck that literally millions were sold and the chances that they would sit around unused by an 85 year old man were a lot higher...at that vehicles only rarely poo up that are truly survivors of this age.
It could happen but much more likely it would be an actual US model and not a grey but anything is possible.
i hear what your saying. i just read up on these grey market units The article was saying that in japan it was cheaper for farmers to buy new tractors every year and we would end up with like new low hour equipment for a fraction of the price. i can imagine people would think they need a tractor, buy it, use it few times or for a particular job, then priorities change and they forget all about it. a friend of mine has a ten year old JD sub compact tractor with only 125 hours. he bought it to do a job but now he just hires landscapers to maintain the property. he is actually trying to sell me a landscape rake because he never uses it. probably only has 25 hrs on it.