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I'm going to guess you don't have a service contract on a system that old (doubtful).
Otherwise you could just open a support case for part number 250-1317.
The same key works on all E250's, E220R's, E420R's, and a few more systems.
I can only guess it leaves you with a couple of alternatives:
A skilled locksmith could take an impression and manufacture a replacement for you.
It's not a particularly sophisticated key design.
The switch that the key controls simply shuttles you across different circuits.
Think of the key as a handle with "permissions".
It might be easier to manufacture a new key than to kludge a replacement for its switch.