Lost and found is located on the 4 floor D terminal close to bank of America..get the elevator in the door #3.. up to the 4 floor. They close at 5:30 PM Monday to Friday
"Lost and found Where did you lose it? On the plane, at the gate or in an Admirals Club® File a lost and found report and we’ll search for your item for up to 30 days. Get email updates on the status and delivery instructions if found." https://www.aa.com/i18n/customer-service/contact-american/lost-and-found.jsp
Hope no-one saw it before someone haded it over to the lost and found office
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