In that case, a ticked off assembly line worker with a pick hammer?
Maybe, but it would have been a damned big pick hammer. Metals fairly thick there and the biggest is probably 3/16" deep. Take a pretty hard wack to make em. Lot of effort too!
Not sure when they built these trucks they knew what a pick hammer was anyway. Looking at the fit and finish I mean. Scraping out some of the body sealer and getting gaps of at least 1/2" inside the cab. Gonna leave the good stuff in place I think.
By the way, the dents are from the outside in.