heck, you could trip in the shower, better now shower.
Back to OP’s issue. I know PDI doesn’t check every, single, solitary thing, but I’m thinking that lead should have been evident at the stealership. Unless it only had a mile on it or something insignificant.
OP: Did you test drive and then re-check the truck? The Rap makes this easy, since you can actually see underneath and granted the skid plates could cause some interference but you can see on top of the front one.
This looks like it would’ve been a challenge to catch though.