Strangely:
Are the primers unplated?
Does your local, or favourite, gunshop stock a variety of Boxer primers, even unplated ones, like Winchester?
I would guess that unless of Russian, Finnish or German origin, such primers would be American in origin.
Is it also "ITAR-busting" to buy the identical (plain-packaged) primers separately and load them into random brass? If the loonies have their way, probably. As the wonderful song about bureaucrats goes. "Whatever you want, the answer's "NO!".
Here's the song: