I found a variety of spare parts, screw, dust, tools, earplugs, etc. in every RV I've owned. That includes Monaco Class As and Airstream trailers. I do not know why they can't be bothered with a $6/hr employee with a vacuum cleaner before things are closed, but it seems to be a universal problem.
The removable panel on the bottom of the Bigfoot would only be a problem if your pickup bed had a watertight liner with no drain holes, and you parked on a serious downhill slope. There is no need for the rest of us to seal those panels.
