I was a little surprised to find some debris inside of my truck box (which is covered with a soft tonneau). There is an open seem in the box bed plate behind the wheel wells and just forward of the rear bulkhead. I checked a few other 2013's in the dealer lot and they are all the same. I assume this is to allow water to drain out. Just wish it were not placed in a spot where debris from the rear wheel can get into the truck box. So far all that I have noticed is some find sand and debris, no water as of yet. Anybody have any problems with this do anything to keep material out of your box?