According to CBP’s FAQ, certain types of ISF coded transactions do not require a bond to cover the ISF requirements. These types include: Household Goods/Personal Effects, Government and Military, Diplomatic, Carnets, International Mail, and Informal Shipments. For full clarification, please refer to CBP’s Q&A document at the following link or contact CBP directly with any questions about ISF exemptions:   http://www.cbp.gov/linkhandler/cgov/trade/cargo_security/carriers/security_filing/10_2faq.ctt/10_2faq.doc