u/Dobby-is-my-Hero

My son flew into DFW last night and left a small bag (no name tag on it) under his seat. He didn’t realize it until they were at baggage claim so he couldn’t go back to the gate to ask about it. Someone sent him to lost & found, but it closed at midnight and it was 12:02. I’m not sure if the lost & found was for AA or for the airport. Any idea for a number to call or how we even start to try to find it. Thanks for any help.