Well, unless I've missed something in the last couple months (entirely likely, but not regarding this case I don't think), this one's stayed unsolved - no ID of the remains, no published theorizing of how they got to that spot near blighted Cardin nor why they were there, nothing to indicate murder or suicide, etc. etc.
So here's my little theory. This small area has seen an influx in immigrants, both legal and illegal, in the last many years, almost all of them hard workers working thankless jobs at the local mushroom plant or at area chicken farming or production locations.
If for some reason - and in humans, reasons for dissatisfaction with life always abound - the man whose remains were found, with a .22 rifle nearby, had fallen into despair - let's say he missed his home in Mexico; or his girlfriend there sent him a Dear John letter; or he'd lost his job here; or his green card was about to expire; or for some other reason he was to be deported; or he had quarreled with a friend or companion here; or if he felt threatened by an acquaintance or by area residents - this man decided to take his life.
It's not hard to find a .22 rifle; he may have owned it or he may have gotten it from a friend. Many Hispanics live in Commerce, and it's less than a 15 minute walk from that town to where the remains near Cardin were found. The road has no heavy traffic at all, especially at night; he wouldn't be noticed. The man takes the rifle and, unknown to others, leaves, walks to the spot, shoots himself, and dies.
If he was friendless here or almost so - who would report his absence, especially if he'd lost a job? If he had friends or lived with friends, would they report it? After all, he could have gone home to Mexico; or, more likely, those friends might not want to get involved with reporting it to area LE - who are not widely trusted by anyone, regardless of race, but particularly by those who have come to the area recently.
Alone and unnoticed the body waits to be found and finally is. If the above holds true, will anyone come forward to state to LE particular circumstances - who the man might be, why the man might have done what he did, or, perhaps, why the gun he used was not his own but was someone else's, someone still living in the area? Not likely - especially on the latter. Too many questions to be put and to have to answer.
I hope an ID is made and a solution is found and the man can have his rightful name and his remains can bear a marker with that name.
But I doubt it; in this area, I doubt it.