Again... in a survival situation, I sure don't want one of my hands full with a briefcase... The briefcase is only usefull if I have it with me the day the survival situation happens and is not practical to carry on a day to day basis.

Briefcases equate to money equate to something worthwhile. In panic situations, a lot of the populous degrade into looting. Here I am in business attire carrying a briefcase. You can bet that the mob would want it.