There is no way to know who stole the belt.
Was it Southwest employees at MCI or DAL? .or.
Was it TSA employees at either airport? .or.
Maybe it was airport employees at MCI or DAL.
Since TSA is the organization that is specifically allowed to sift thru your belongings, maybe you should start by filing a complaint with TSA
https://www.tsa.gov/contact-center/form/complaints
@theweddingdiva0
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