Recently I acquired a lot that contained 10 boxes of 7.9(2)x57 surplus from a local auction house. The boxes were a mix, with 4 boxes being uxa 44 headstamps, 4 blank, one uxa 4, and one marked Ecuador. The 9 boxes of uxa 44, uxa 4, and blank were all packaged alike. There was nothing officially marked on the boxes. All the markings that there are can be seen in the picture.
However, looking at the rounds, they certainly speak of having the same origin.
The box from Ecuador seems to have different origins. Packed in a labeled box and in clips, not loose.