I don't even know how much is in my cold storage as I haven't accessed it in a number of years.
Smart. Attackers can't know how much you are holding if you don't know how much you are holding. Perhaps this is the best way to protect against $5 wrench attacks.

Sure they could. An attacker could use blockchain analysis to reasonably conclude a lower bound of how much coin a person is holding. An attacker could use a set of known facts to conclude a person is holding a large amount of coin. Feigning ignorance is not going to stop you from getting robbed.
Sure, but physical attacks with the aim of stealing bitcoin aren't happening by approaching random people on the street in the spur of the moment. The attack is targeted and planned, and the attacker usually knows the victim is holding a significant amount of bitcoin. Often they are home invasions, or fake meetups under the pretense of trading. <>
Unless you are involved in these types of attacks, you do not have any way of knowing this. These types of attacks are not well publicized.