Yes, gold has often been included in E&E kits. In many parts of the world they are very afraid of counterfeit dollars, and it is common to find counterfeit bills in some areas. Pure gold can be tested easily, or at least people thinks so. Watches, gold jewelry and other valuables can be used for barter. Depending on the individual's duties and areas or travel, I can make some more recommendations for you if you like, everything can be procured open source.