They(The dealers) are required to have you present:
1.The Vehicle
2.The Registration showing YOU as the Owner [Or a Power of Attorney].
3.YOU [Or Your Agent with power of Attorney].

To Pick Up;
1.Key(s)
2.Lock Devices
3.Electronic Lock Devices (Includes Infrared and RF)

The Factory Wants Them(The Dealers) to fit the key to the lock of Said Mercedes with the Owner (Or His/Her Legal Agent) Present.

I don't know if all the security requirements are mandated for "Ordering".

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'84 300SD sold
124.128