* The Key Itself: Sometimes, a key number is stamped onto the key blade itself. Look closely at all sides.
* The Owner's Manual: Check your owner's manual. While unlikely to have the key number directly, it *might* have information on where to find it or who to contact.
* Mercedes-Benz Dealer: This is your best bet. Take your vehicle's title or registration to a Mercedes-Benz dealership. They can access your vehicle's information through their system and find the key number associated with your VIN. They might also be able to have a new key made for you.
* Your Vehicle's Documentation: If you have any paperwork related to purchasing the van or having keys made in the past, that might have the key number listed.
Keep in mind that if you need a replacement key, the dealership is the most efficient route. They can cut a key that matches your vehicle's ignition system without needing the key number. Providing your VIN is sufficient for them.
