My son lost his passort card--NOT his passport. What do we need to do?

Question: My 12 year old son lost his wallet and it contained his small passport card, with the passport number on it. He DID NOT loose his passport.

Source: http://www.us-passport-service-guide.com/my-son-lost-his-passort-cardnot-his-passport-what-do-we-need-to-do.html

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