The first two boxes are Chinese Commercial X39 ammo neither of which had been imported into the US since the 1994 ban,it can still be found from time to time but once gone it will be no more,it comes in a variety of different colored packaging,in both lead and steel core FMJ and SP. The Silver box is the best of the lot,the lead tip on the Chinese SP is usually pretty brittle and brakes off easy. Both have steel jacket bullets and lead cores and are usually fairly accurate and cleaner than Wolf.
The third box is Russian HP much of the Russian ammo imported in the early 90's was packed like this,it can be found in plain white,gray and brown boxes in FMJ and HP. The HP expansion can be iffy at times,it has a steel jacket and lead core as well. It's similar to Wolf HP ammo on the market today as far as being dirty and accuracy.
The forth box is Romanian,Century Arms imported the first Romanian ammo into the US market,it's now sold under the Hot Shot brand name. From most of my readings it about the worst as far a being dirty and quality control.
I've shot all the above ammo except for the Romanian and it's not corrosive.
The China North Industries Corporation official English name Norinco, manufactures vehicles (trucks, cars and motorcycles), machinery, optical-electronic products, oil field equipment, chemicals, light industrial products, explosives and blast materials, civil and military firearms and ammunition, etc. Norinco is also involved in domestic civil construction projects.
Norinco is also known outside of China for its high-tech defense products, some of which are adaptations of Soviet equipment. Norinco produces precision strike systems, amphibious assault weapons and equipment, long-range suppression weapon systems, anti-aircraft & anti-missile systems, information & night vision products, high-effect destruction systems,fuel air bombs, anti-terrorism & anti-riot equipment and small arms.