Ok I've figured this all out now
I know why they couldn't recognize my car at the dealership, and why they asked me to bring the data card in.
well John at the classic center figured it out for me. I left him a message today about my situation and left the vin# in the message.
He called me right back, and straight away knew that my vin# was incorrect. since I have it as 140601........ he said it should start with 114 (I'm sure most of you guys know this!) so anyway, turns out the previous owner has had the vin screwed up, missing the first 1, and so all my reg, ins documentation is wrong
But this guy figured it out in seconds, whereas the parts manager at MBmanhattan didn't care to troubleshoot why my vin didn't show in the system...
The BEST PART: John is ordering the key for me at a fraction of the cost that MB Manhattan wants for it. He said MB manhattan is the only dealership owned by mercedes and they should not be charging $40 for a new key!!
So Jos, I don't think you need the data card as long as your vin# is correct. But you should call in to the classic center and try to order it through them, as you'll save a bunch of $ and 2 trips to Hell's kitchen.
He's also sending me a replacement latch for my glove box, as he asked if there was anything else I could think of that I needed...
Anyway, an awesome experience!