For what it's worth, both boxes have the "Made in USA" text on them. There is no other information regarding this other than the text on the end of the box.
I fitted the XRF lower ball joints yesterday, will grease them up today and do a driveway alignment. They went together as expected, the ball stud could be moved in the socket by hand and there was no freeplay detected. The rubber boots came already mounted on the ball studs.