JamGear,
I have the same issue with my 2014 Silverado DC Z-71. I didn't notice it until a few days after I got it home. It looks like a couple of small dents or ripples at the very top of the bed, just under the plastic rail, only on the drivers side of the bed. It kind of bothers me, as I'm pretty sure it was there at the time of delivery and I didn't notice it. Not sure if there is anything that can be done now...
One thing that is different from you is that I haven't done any hauling yet, so I don't think my issue relates to that. Would someone putting their elbows on it really dent it? If so, that is pretty weak..
Thanks.