I suppose brainy folks are making sure they keep them secure. It would really be a pity if someone somehow would steal them. I don't doubt these people know well how they're protecting them from greedy hands. By the way, I'm not sure it's the appropriate place to share this article (https://www.jdsupra.com/legalnews/i-received-a-finra-8210-letter-now-what-5734433/) with you; however, if you receive FINRA 8210 letters, you'd have some knowledge about how to deal with them and what to answer back. All the best!