Finding them was kind of a trick through. Not many of those that hit the earth are metal and stay together enough to be of use. The famous crater in Arizona is probably what happened when they were too large, it just vaporized rather then being a large lump of metal.
So it would need to be made of the right stuff, be the right size and come down where people could see it land, understand what it was and go find it.
It happened, obviously. But rarely.
There is an area in south Georgia where fairly large ones are plowed-up in large numbers. A farmer gave my wife a 150 pounder, which she put in her flower garden in the front yard.
They can cause considerable damage to plows.