Possible Solution

Someone has regularly been ripping off Wal-Mart.

This person has emptied out the big luggage, put an expensive item inside (like an electric cooker), buys the luggage (trusting that no clerk will look inside), then returns it--keeping the expensive item. Excuse for returning the luggage: No smaller pieces inside, as was advertised on the label outside.

As I noted, ALL of the similar large pieces of luggage had no smaller pieces inside.