As I have stated elsewhere, when AMEX first was added as a credit card option, it was pulled temporarilty because they wanted to treat it as a cash advance. The govt made it very clear that that was not their purpose for bond putchases - that people borrowed money to buy them. It got settled, and AMEX was added back in. So it is AMEX's aggreement with the US govt that these bonds be treated as purchases. I received e-mails from the US Savings Bonds dept in regard to this. Every purchase (AMEX Starwood) has been treated as a purchase. Why don't you wait a few days, check on-line - probably you will see it correctly handled.
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Ms.DtG