It’s 90% Chicago & LA 90% of the time, historically.

There are two ports where consumer products enter the United States from the ocean/Asia: LA, and to a much lesser degree Seattle. That’s it.

Both essentially lead directly to Chicago from the west coast, with very little inbetween.

Eg Texas freight lines are for transporting things like animal feed and crushed gravel to export terminals with little in the way of hubs. Florida isn’t significant and its port capacity is minuscule, repeat for most of the country.

Massive (unguarded) consumer products hub x population, Chicago is the only other qualifier, where rail theft is unsurprisingly also a constant issue.

Not sure how much you can conclude based on one city. You’d need per capita package loss data on dozens of cities while also accounting for package volume per city.