General - Fecal coliform is a concern but no where near as high on the list as the superbugs are, plus FC is killable with simple alchoal, where as MRSA, VRE, and others require much more.

As for how its transmitted thats easy simple contact can spread germs from one surface to another so if shoes have it, and placed on the belt, its not to far off for it in the future to be passed onto the surfaces of the bin.

are you sure its a non-issue? because its probably like most things dealing with TSA with obsfication of the facts and sweeping it under the rug things never come to light unless someone really digs.