Kokua Line: Why didn’t I get full passport order?

Question: I mailed in my application and payment for a passport book and a passport card in mid-February. I received the passport book in the mail on Friday, but not the passport card. Is this usual? Also, what is a passport card exactly? I checked the box because it seemed like a good deal. Also, will I get my old passport back? I had to mail it in with my application.

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