CZ mag and 922r compliance question

I was wondering if anybody knows the answer to this. I ordered some mags for my scorpion that I plan to SBR. The label on the bags that the mags came in say CZ-USA. The mag body says “CZ MAG”. The base plate says “CZ USA”. The follower has no markings other than “9x19mm”. I know that these are potentially three pieces toward the 6 I need to be US sourced, but is there any way to be confident that all three are US (or really, that I could prove it to LEO if that .001% chance occurred that I would need to)? Is seems like these should be US mags, but I feel like I could only prove 1 of the three parts.