Btw, I originally got the SEC with 2 original and 1 valet key. They only worked in the passenger door and ignition. They must have been worn, because 2 new keys ordered with VIN # via the dealer work in all locks.
I think what you had were two working keys for the ignition and front doors, and one valet key for the trunk that also worked with everythng. With the VIN number you got two keys that fit everything. I heard that MB no longer provides keys via the VIN number, but a locksmith can make copies, which is good if the locks work.
Oops, goofed again. doofus got the upper hand. Valet key us oval shaped and does not work the trunk. square shape key opens everything. theory was that valuables which MB owners are reputed to have in excessive numbers were to be put in trunk when dining out and oval shaped key given to sneaky valets. enough
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It would surprise me if the dealer no longer takes orders for keys. I would call the dealer. Where did you hear this?
At this point changing the locks would make sense. In an ideal world you would order all new locking cylinders for doors, trunk, and ignition, with an extra key for a total of 2 new keys. But it will cost $.
The locking set you got from the wrecker would be easier to re key if you had at least one matching key and for adapting / matching the locksmith had a new un worn key via dealer and your proof of ownership = pink slip copy. Btw all Mercedes Benz USA keys etc come from Fort Worth TX. A competent locksmith can mach these to your original key, but preferably not a worn key.
Btw, if or when you pull the locking cylinder from housing, make sure not to lose / drop any tumbler bits.
It might be a good idea to have some large zip lock bags handy.
I was in a somewhat similar situation when a mechanic who worked on my SEC took off with one of my business vans and .a set of my SEC keys. At the wrecking yard, it took some time, but we managed to find a Coupe with 1 key and removed the complete set of locks incl ignition, and installed in my coupe..
I removed the cars build plaque from the cross member over radiator and kept it in an envelope with the yards receipt. Some time later we lost that key as well / I was left with no key.
I told the guys at dealer about the thief having the key for my original locks, and with my pink slip, the other SEC's build plaque and wrecker receipt, the dealer ordered 2 keys for the wrecked cars lock set and changed the info in MB Fort Worth data base, should I need additional keys in future.
For this to work you need a friendly guy at the dealer, and the build plaque of a car the does no longer exist with DMV etc.
I don't think there is a cheap and simple solution, unless you have experience with these locks yourself.
I found a post of someone resurrecting a completely frozen and even partially broken BMW 2002 lock
Repairing and Re-Keying Sticky Door Locks or search youtube
Best of luck