How did they measure?
Maybe try buying from a place with a good return policy, and return if you don't like them? That's the best I can think of.
I have problem with my OCC cable from Hifiman HE-6 which has started to oxidize couple a weeks ago and it's looks worse every week.
I really don't want to send cable to service, 2-3 weeks without Hifiman gonna be really hard :P I'm also really intressed to try Hifiman silver cable, so how can we solve this problem?