This explains two traits of the survivalist. First they are closed mouthed about their situation. They do not tell people about their stock. They do not tell that they have it, where it is kept, what things it includes, or how much is in it. Even disclosing the interest allows the shrewd person to guess that they are likely to have stores.
Many survivalists conceal that they even have the mindset.
Most practice normal daily life and social interaction, just not mentioning their concern, but some withdraw from public aspects of life. This makes them a bit of a mystery and they can seem distant from others. Heck, they probably want to bomb town hall. Most survivalists are actually normal people, with normal community and family lives that happen to be concerned, make prudent plans, and don't talk about it to every man they meet in the street. The second trait is that the survivalist is able to protect their stocks.