We call it "tarnish," but it is still just oxidation.
However, it does not flake off any white powder and it's highly unlikely it has plastic handles. None of my silver has ever left a white powder no matter how long it has been between cleaning.
If I were trying to go full on Sherlock Holmes, I would layer some paper towels in there to try to figure out where it's happening.
Take everything out and put a paper towel in the bottom of the drawer.
Then make a burrito out of the utensils using a paper towel as the tortilla.
Then put another one over the top of the drawer just to overdo it a little.
After your next drive you'll be able to see if it's coming from the top of the drawer, the utensils themselves, or the bottom of the drawer.
If you have the patience, you could leave it that way for a while to see if the powder is a function of the miles you've driven or just the passing of time.
2014 RAM 3500 Diesel 4x4 Dually long bed. AISIN trans & 4.10 rear. B&W RVK3600 hitch • 2015 Crossroads Elevation Homestead Toy Hauler ("The Taj Mahauler") • Hooligan #3