Which brake pads to choose if you have fake carbon clinchers
I urge you not to ride these. I can't emphasize this strongly enough.

Almost all carbon manufacturing in the bike industry is done in China or Taiwan. There are likely to be a number of lesser known but good brands. For example, a number of posters on the Weight Weenies forum report good experience with Light Bicycle rims. I suspect but can't confirm that November Bicycles uses many Light Bicycle rims in its lineup, e.g. these wheels. In any case, their blog straight up admits that they've inspected and had good experience with their China-based rim suppliers. I've seen forum users endorse other lesser-known brands as well.

Fake goods are another issue entirely. These are fake. There may be rumors circulating that the factories for major Western brands, e.g. Pinarello, sell surplus product at lower prices through other channels. As discussed on the article, however, those are fakes. This Bikebiz article focused on fake frames, and it asserted that those are likely to come from low-quality factories with poor quality control. I'd suspect that the same applies to wheels.

Basically, it's possible that the carbon involved could have structural flaws that you can't see (e.g. voids that will propagate as stress fractures). Most factories in China do, in fact, conduct safety testing, but the ones producing fakes are very unlikely to do this. You could have the rims inspected, but this would require someone with knowledge of composites manufacturing and repair and an ultrasonic scanner or some other type of scanner. You would have been better off buying a lower-priced set of carbon wheels that were made in China, but were inspected by a retailer you trust and that has business insurance and a warranty. Or even just pony up for the Zipps.