UL has a procedure known as "field reports," where such matters are initiated.
I would have loved to run these fixtures down, but I lacked some co-operation from the owner. I suspect they were picked up on a trip south of the border.
There was, other than the UL lables and a "made in Mexico" lable, absolutely no identification of any sort on them.
I forgot to mention that they also lacked any means of grounding.