Since the source seems to be social media posts, there's a small possibility that theft may be some kind of portion of the number, but I'm not sure due to the questionable accuracy of source data.

Semi-related: I work for a homeless service agency and a few of our clients were arrested for a tiny luggage theft ring at LAX a couple of months ago. One of the detectives said that some of the luggage they found was reported missing and it was luck that someone else had airtags hidden in their luggage to be able to track the item which allowed them to discover more items from others.