Social Security needs to know information about your (and your spouse’s, if you are married and living together) income and resources.
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Book Entry Securities - In addition to traditional U.S. Savings Bonds, individuals now may go to the Treasury Department's Internet site and make online purchases of electronic savings bonds. Electronic savings bonds are also called "book entry securities." With book entry securities, the individual's investment is recorded electronically by the Treasury Department and a paper savings bond is not issued. If you have book entry securities, they are counted as resources and should be reported on this application.
If you do not have these documents, provide us with your best estimate so that we can tell you whether you are likely to qualify for extra help with your prescription drug costs. This information is to help you complete the application. You will not have to submit the documents unless contacted by a Social Security representative.
Also see:
(Source: Social Security Administration: Understanding The Extra Help With Your Medicare Prescription Drug Plan publication 10508, January 2011. Additional examples and links from Q1Group LLC)