Luperon?
I went to look at some of these little tin boxes, the location was on the Luperon, west-side. Roughly in the mid-point between shore and the Botanico, near the small airport (guerrera?, I don't recall the name).
They had come over from the East in containers, some had the roofs chopped off so that they could fit more of them in the containers. They welded them back together and it was as good as new, almost.
Very cheap prices, but I don't remember any of that information.