While maybe not the only end user, I agree with Peelen that Israel probably got a lot of the ammo. The Czechs were very friendly to Israel until the USSR invaded Czechoslovakia and controlled things for years thereafter, forcing the Czechs to follow the Soviet preference for the cause of all the troubles in the ME, rather than Israel.
Years ago, Pacific International Merchandising Corp. of Sacramento, California, brought in a huge shipment of loose, largely “battle-field scrounge” ammunition from Israel. There were big wooden boxes that perhaps held as much as 10,000 rounds of 9 mm just loose in the box. It took a decent fork life to move them. We skimmed only the top of one - all we had time for on a visit there - and looked through perhaps a thousand rounds of ammo. While there was stuff from all over the globe in there, we found plenty of “ndn” and “oma” stuff among it. Regretably, we did not find an “oma 44” which is incredibly rare.
I think it is hard, though, to ascribe it to one recipient and one year. Both the oma and ndn headstamps are found with black primer seals, red primer and neck seals, a kind of a grey bullet but I don’t think sintered-iron, GMCS and even brass-jacket bullets. It would appear that it was made over a time period, or perhaps simply loaded more than just in 1948. The ones with red seals may even be a remanufacture along the lines of what Iterarms had done with corrosive Finnish 9 mm to have it turned into non-corrosive, in Finland, which including resealing the cartridges, formerly mostly with green seals, all resealed with red lacquer to indicate NC loading.
Some of the other countries heavily represented in that ammo we went thru at PIMCo were Egypt, Syria, France, England, US, Israel, assorted WWII Western European. Some not so prolific in number were Yugoslavia, Bulgaria and Lebanon. I am sure I am only remembering about half of them. Even the little I gleaned from what we went thru were a big help to what was then a fairly modest collection of 9 mm, including my only Lebonese rounds ever available to me, Syrian, a couple of good Yugo rounds, and a couple of equally good Bulgarian. My French collection tripled or quadrupled from that trip to Sacramento.
Those were the good old days for cartridge collectors of imports of surplus military ammo. Yes, they really were!