Good to know. I think all of the equipment at my job is 318 stainless, which is non-magnetic (I work in the mix area of a personal care/cosmetics plant). Needles are generally 304 which is generally non-magnetic.
What about c) Do want to give away that we have this capability?
Seems like this whole thing could be an operation to determine our response times, strategies, and capabilities.
I read that normally they have filters in place for monitoring systems to block out white noise but they removed those filters after the Chinese spy balloon. My guess is that this is why they are suddenly picking up all these things. So, to answer your question, yes!